forked from M-Labs/nac3
592 lines
18 KiB
Rust
592 lines
18 KiB
Rust
use super::typedef::{Type::*, *};
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use std::collections::HashMap;
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use std::rc::Rc;
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fn find_subst(
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ctx: &GlobalContext,
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valuation: &Option<(VariableId, Rc<Type>)>,
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sub: &mut HashMap<VariableId, Rc<Type>>,
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mut a: Rc<Type>,
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mut b: Rc<Type>,
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) -> Result<(), String> {
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// TODO: fix error messages later
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if let TypeVariable(id) = a.as_ref() {
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if let Some((assumption_id, t)) = valuation {
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if assumption_id == id {
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a = t.clone();
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}
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}
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}
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let mut substituted = false;
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if let TypeVariable(id) = b.as_ref() {
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if let Some(c) = sub.get(&id) {
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b = c.clone();
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substituted = true;
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}
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}
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match (a.as_ref(), b.as_ref()) {
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(BotType, _) => Ok(()),
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(TypeVariable(id_a), TypeVariable(id_b)) => {
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if substituted {
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return if id_a == id_b {
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Ok(())
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} else {
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Err("different variables".to_string())
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};
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}
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let v_a = ctx.get_variable(*id_a);
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let v_b = ctx.get_variable(*id_b);
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if v_b.bound.len() > 0 {
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if v_a.bound.len() == 0 {
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return Err("unbounded a".to_string());
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} else {
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let diff: Vec<_> = v_a
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.bound
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.iter()
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.filter(|x| !v_b.bound.contains(x))
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.collect();
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if diff.len() > 0 {
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return Err("different domain".to_string());
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}
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}
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}
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sub.insert(*id_b, a.clone().into());
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Ok(())
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}
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(TypeVariable(id_a), _) => {
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let v_a = ctx.get_variable(*id_a);
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if v_a.bound.len() == 1 && v_a.bound[0].as_ref() == b.as_ref() {
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Ok(())
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} else {
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Err("different domain".to_string())
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}
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}
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(_, TypeVariable(id_b)) => {
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let v_b = ctx.get_variable(*id_b);
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if v_b.bound.len() == 0 || v_b.bound.contains(&a) {
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sub.insert(*id_b, a.clone().into());
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Ok(())
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} else {
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Err("different domain".to_string())
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}
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}
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(_, VirtualClassType(id_b)) => {
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let mut parents;
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match a.as_ref() {
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ClassType(id_a) => {
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parents = [*id_a].to_vec();
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}
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VirtualClassType(id_a) => {
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parents = [*id_a].to_vec();
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}
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_ => {
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return Err("cannot substitute non-class type into virtual class".to_string());
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}
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};
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while !parents.is_empty() {
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if *id_b == parents[0] {
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return Ok(());
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}
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let c = ctx.get_class(parents.remove(0));
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parents.extend_from_slice(&c.parents);
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}
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Err("not subtype".to_string())
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}
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(ParametricType(id_a, param_a), ParametricType(id_b, param_b)) => {
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if id_a != id_b || param_a.len() != param_b.len() {
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Err("different parametric types".to_string())
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} else {
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for (x, y) in param_a.iter().zip(param_b.iter()) {
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find_subst(ctx, valuation, sub, x.clone(), y.clone())?;
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}
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Ok(())
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}
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}
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(_, _) => {
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if a == b {
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Ok(())
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} else {
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Err("not equal".to_string())
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}
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}
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}
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}
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fn resolve_call_rec(
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ctx: &GlobalContext,
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valuation: &Option<(VariableId, Rc<Type>)>,
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obj: Option<Rc<Type>>,
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func: &str,
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args: &[Rc<Type>],
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) -> Result<Option<Rc<Type>>, String> {
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let mut subst = obj
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.as_ref()
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.map(|v| v.get_subst(ctx))
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.unwrap_or(HashMap::new());
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let fun = match &obj {
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Some(obj) => {
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let base = match obj.as_ref() {
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TypeVariable(id) => {
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let v = ctx.get_variable(*id);
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if v.bound.len() == 0 {
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return Err("unbounded type var".to_string());
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}
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let results: Result<Vec<_>, String> = v
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.bound
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.iter()
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.map(|ins| {
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resolve_call_rec(
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ctx,
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&Some((*id, ins.clone())),
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Some(ins.clone()),
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func,
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args.clone(),
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)
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})
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.collect();
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let results = results?;
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if results.iter().all(|v| v == &results[0]) {
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return Ok(results[0].clone());
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}
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let mut results = results.iter().zip(v.bound.iter()).map(|(r, ins)| {
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r.as_ref()
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.map(|v| v.inv_subst(&[(ins.clone(), obj.clone().into())]))
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});
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let first = results.next().unwrap();
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if results.all(|v| v == first) {
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return Ok(first);
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} else {
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return Err("divergent type after substitution".to_string());
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}
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}
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PrimitiveType(id) => &ctx.get_primitive(*id),
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ClassType(id) | VirtualClassType(id) => &ctx.get_class(*id).base,
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ParametricType(id, _) => &ctx.get_parametric(*id).base,
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_ => return Err("not supported".to_string()),
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};
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base.methods.get(func)
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}
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None => ctx.get_fn(func),
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}
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.ok_or("no such function".to_string())?;
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if args.len() != fun.args.len() {
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return Err("incorrect parameter number".to_string());
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}
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for (a, b) in args.iter().zip(fun.args.iter()) {
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find_subst(ctx, valuation, &mut subst, a.clone(), b.clone())?;
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}
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let result = fun.result.as_ref().map(|v| v.subst(&subst));
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Ok(result.map(|result| {
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if let SelfType = result {
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obj.unwrap()
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} else {
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result.into()
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}
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}))
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}
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pub fn resolve_call(
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ctx: &GlobalContext,
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obj: Option<Rc<Type>>,
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func: &str,
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args: &[Rc<Type>],
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) -> Result<Option<Rc<Type>>, String> {
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resolve_call_rec(ctx, &None, obj, func, args)
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::primitives::*;
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#[test]
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fn test_simple_generic() {
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let mut ctx = basic_ctx();
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assert_eq!(
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resolve_call(&ctx, None, "int32", &[PrimitiveType(FLOAT_TYPE).into()]),
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Ok(Some(PrimitiveType(INT32_TYPE).into()))
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);
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assert_eq!(
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resolve_call(&ctx, None, "int32", &[PrimitiveType(INT32_TYPE).into()],),
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Ok(Some(PrimitiveType(INT32_TYPE).into()))
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);
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assert_eq!(
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resolve_call(&ctx, None, "float", &[PrimitiveType(INT32_TYPE).into()]),
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Ok(Some(PrimitiveType(FLOAT_TYPE).into()))
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);
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assert_eq!(
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resolve_call(&ctx, None, "float", &[PrimitiveType(BOOL_TYPE).into()]),
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Err("different domain".to_string())
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);
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assert_eq!(
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resolve_call(&ctx, None, "float", &[]),
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Err("incorrect parameter number".to_string())
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);
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let v1 = ctx.add_variable(VarDef {
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name: "V1",
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bound: vec![
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PrimitiveType(INT32_TYPE).into(),
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PrimitiveType(FLOAT_TYPE).into(),
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],
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});
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assert_eq!(
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resolve_call(&ctx, None, "float", &[TypeVariable(v1).into()]),
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Ok(Some(PrimitiveType(FLOAT_TYPE).into()))
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);
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let v2 = ctx.add_variable(VarDef {
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name: "V2",
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bound: vec![
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PrimitiveType(BOOL_TYPE).into(),
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PrimitiveType(INT32_TYPE).into(),
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PrimitiveType(FLOAT_TYPE).into(),
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],
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});
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assert_eq!(
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resolve_call(&ctx, None, "float", &[TypeVariable(v2).into()]),
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Err("different domain".to_string())
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);
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}
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#[test]
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fn test_methods() {
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let mut ctx = basic_ctx();
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let v0 = Rc::new(TypeVariable(ctx.add_variable(VarDef {
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name: "V0",
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bound: vec![],
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})));
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let v1 = Rc::new(TypeVariable(ctx.add_variable(VarDef {
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name: "V1",
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bound: vec![
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PrimitiveType(INT32_TYPE).into(),
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PrimitiveType(FLOAT_TYPE).into(),
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],
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})));
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let v2 = Rc::new(TypeVariable(ctx.add_variable(VarDef {
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name: "V2",
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bound: vec![
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PrimitiveType(INT32_TYPE).into(),
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PrimitiveType(FLOAT_TYPE).into(),
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],
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})));
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let v3 = Rc::new(TypeVariable(ctx.add_variable(VarDef {
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name: "V3",
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bound: vec![
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PrimitiveType(BOOL_TYPE).into(),
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PrimitiveType(INT32_TYPE).into(),
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PrimitiveType(FLOAT_TYPE).into(),
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],
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})));
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let int32 = Rc::new(PrimitiveType(INT32_TYPE));
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let int64 = Rc::new(PrimitiveType(INT64_TYPE));
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// simple cases
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assert_eq!(
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resolve_call(&ctx, Some(int32.clone()), "__add__", &[int32.clone()]),
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Ok(Some(int32.clone()))
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);
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assert_ne!(
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resolve_call(&ctx, Some(int32.clone()), "__add__", &[int32.clone()]),
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Ok(Some(int64.clone()))
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);
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assert_eq!(
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resolve_call(&ctx, Some(int32.clone()), "__add__", &[int64.clone()]),
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Err("not equal".to_string())
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);
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// with type variables
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assert_eq!(
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resolve_call(&ctx, Some(v1.clone()), "__add__", &[v1.clone()]),
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Ok(Some(v1.clone()))
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);
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assert_eq!(
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resolve_call(&ctx, Some(v0.clone()), "__add__", &[v2.clone()]),
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Err("unbounded type var".to_string())
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);
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assert_eq!(
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resolve_call(&ctx, Some(v1.clone()), "__add__", &[v0.clone()]),
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Err("different domain".to_string())
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);
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assert_eq!(
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resolve_call(&ctx, Some(v1.clone()), "__add__", &[v2.clone()]),
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Err("different domain".to_string())
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);
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assert_eq!(
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resolve_call(&ctx, Some(v1.clone()), "__add__", &[v3.clone()]),
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Err("different domain".to_string())
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);
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assert_eq!(
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resolve_call(&ctx, Some(v3.clone()), "__add__", &[v1.clone()]),
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Err("no such function".to_string())
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);
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assert_eq!(
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resolve_call(&ctx, Some(v3.clone()), "__add__", &[v3.clone()]),
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Err("no such function".to_string())
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);
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}
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#[test]
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fn test_multi_generic() {
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let mut ctx = basic_ctx();
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let v0 = Rc::new(TypeVariable(ctx.add_variable(VarDef {
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name: "V0",
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bound: vec![],
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})));
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let v1 = Rc::new(TypeVariable(ctx.add_variable(VarDef {
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name: "V1",
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bound: vec![],
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})));
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let v2 = Rc::new(TypeVariable(ctx.add_variable(VarDef {
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name: "V2",
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bound: vec![],
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})));
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let v3 = Rc::new(TypeVariable(ctx.add_variable(VarDef {
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name: "V3",
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bound: vec![],
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})));
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ctx.add_fn(
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"foo",
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FnDef {
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args: vec![v0.clone(), v0.clone(), v1.clone()],
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result: Some(v0.clone()),
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},
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);
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ctx.add_fn(
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"foo1",
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FnDef {
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args: vec![
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ParametricType(TUPLE_TYPE, vec![v0.clone(), v0.clone(), v1.clone()]).into(),
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],
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result: Some(v0.clone()),
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},
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);
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assert_eq!(
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resolve_call(&ctx, None, "foo", &[v2.clone(), v2.clone(), v2.clone()]),
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Ok(Some(v2.clone()))
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);
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assert_eq!(
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resolve_call(&ctx, None, "foo", &[v2.clone(), v2.clone(), v3.clone()]),
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Ok(Some(v2.clone()))
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);
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assert_eq!(
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resolve_call(&ctx, None, "foo", &[v2.clone(), v3.clone(), v3.clone()]),
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Err("different variables".to_string())
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);
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assert_eq!(
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resolve_call(
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&ctx,
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None,
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"foo1",
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&[ParametricType(TUPLE_TYPE, vec![v2.clone(), v2.clone(), v2.clone()]).into()]
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),
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Ok(Some(v2.clone()))
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);
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assert_eq!(
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resolve_call(
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&ctx,
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None,
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"foo1",
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&[ParametricType(TUPLE_TYPE, vec![v2.clone(), v2.clone(), v3.clone()]).into()]
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),
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Ok(Some(v2.clone()))
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);
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assert_eq!(
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resolve_call(
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&ctx,
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None,
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"foo1",
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&[ParametricType(TUPLE_TYPE, vec![v2.clone(), v3.clone(), v3.clone()]).into()]
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),
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Err("different variables".to_string())
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);
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}
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#[test]
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fn test_class_generics() {
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let mut ctx = basic_ctx();
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let list = ctx.get_parametric_mut(LIST_TYPE);
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let t = Rc::new(TypeVariable(list.params[0]));
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list.base.methods.insert(
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"head",
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FnDef {
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args: vec![],
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result: Some(t.clone()),
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},
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);
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list.base.methods.insert(
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"append",
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FnDef {
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args: vec![t.clone()],
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result: None,
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},
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);
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let v0 = Rc::new(TypeVariable(ctx.add_variable(VarDef {
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name: "V0",
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bound: vec![],
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})));
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let v1 = Rc::new(TypeVariable(ctx.add_variable(VarDef {
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name: "V1",
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bound: vec![],
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})));
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assert_eq!(
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resolve_call(
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&ctx,
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Some(ParametricType(LIST_TYPE, vec![v0.clone()]).into()),
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"head",
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&[]
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),
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Ok(Some(v0.clone()))
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);
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assert_eq!(
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resolve_call(
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&ctx,
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Some(ParametricType(LIST_TYPE, vec![v0.clone()]).into()),
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"append",
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&[v0.clone()]
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),
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Ok(None)
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);
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assert_eq!(
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resolve_call(
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&ctx,
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Some(ParametricType(LIST_TYPE, vec![v0.clone()]).into()),
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"append",
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&[v1.clone()]
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),
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Err("different variables".to_string())
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);
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}
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|
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#[test]
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fn test_virtual_class() {
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let mut ctx = basic_ctx();
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|
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let foo = ctx.add_class(ClassDef {
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base: TypeDef {
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name: "Foo",
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methods: HashMap::new(),
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fields: HashMap::new(),
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},
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parents: vec![],
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});
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let foo1 = ctx.add_class(ClassDef {
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base: TypeDef {
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name: "Foo1",
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methods: HashMap::new(),
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fields: HashMap::new(),
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},
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parents: vec![foo],
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});
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let foo2 = ctx.add_class(ClassDef {
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base: TypeDef {
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name: "Foo2",
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methods: HashMap::new(),
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fields: HashMap::new(),
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},
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parents: vec![foo1],
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});
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let bar = ctx.add_class(ClassDef {
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base: TypeDef {
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name: "bar",
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methods: HashMap::new(),
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fields: HashMap::new(),
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},
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parents: vec![],
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});
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ctx.add_fn(
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"foo",
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FnDef {
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args: vec![VirtualClassType(foo).into()],
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result: None,
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},
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);
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ctx.add_fn(
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"foo1",
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FnDef {
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args: vec![VirtualClassType(foo1).into()],
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result: None,
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},
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);
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assert_eq!(
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resolve_call(&ctx, None, "foo", &[ClassType(foo).into()]),
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Ok(None)
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);
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assert_eq!(
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resolve_call(&ctx, None, "foo", &[ClassType(foo1).into()]),
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Ok(None)
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);
|
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|
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assert_eq!(
|
|
resolve_call(&ctx, None, "foo", &[ClassType(foo2).into()]),
|
|
Ok(None)
|
|
);
|
|
|
|
assert_eq!(
|
|
resolve_call(&ctx, None, "foo", &[ClassType(bar).into()]),
|
|
Err("not subtype".to_string())
|
|
);
|
|
|
|
assert_eq!(
|
|
resolve_call(&ctx, None, "foo1", &[ClassType(foo1).into()]),
|
|
Ok(None)
|
|
);
|
|
|
|
assert_eq!(
|
|
resolve_call(&ctx, None, "foo1", &[ClassType(foo2).into()]),
|
|
Ok(None)
|
|
);
|
|
|
|
assert_eq!(
|
|
resolve_call(&ctx, None, "foo1", &[ClassType(foo).into()]),
|
|
Err("not subtype".to_string())
|
|
);
|
|
|
|
// virtual class substitution
|
|
assert_eq!(
|
|
resolve_call(&ctx, None, "foo", &[VirtualClassType(foo).into()]),
|
|
Ok(None)
|
|
);
|
|
assert_eq!(
|
|
resolve_call(&ctx, None, "foo", &[VirtualClassType(foo1).into()]),
|
|
Ok(None)
|
|
);
|
|
assert_eq!(
|
|
resolve_call(&ctx, None, "foo", &[VirtualClassType(foo2).into()]),
|
|
Ok(None)
|
|
);
|
|
assert_eq!(
|
|
resolve_call(&ctx, None, "foo", &[VirtualClassType(bar).into()]),
|
|
Err("not subtype".to_string())
|
|
);
|
|
}
|
|
}
|