[standalone] Update globals.py with type-inferred global var

Required for when globals are read without the use of a global
declaration.

nac3core/src/codegen/expr.rs

@@ -2886,7 +2886,31 @@ pub fn gen_expr<'ctx, G: CodeGenerator>(
             Some((_, Some(static_value), _)) => ValueEnum::Static(static_value.clone()),
             None => {
                 let resolver = ctx.resolver.clone();
-                resolver.get_symbol_value(*id, ctx, generator).unwrap()
+                let value = resolver.get_symbol_value(*id, ctx, generator).unwrap();
+
+                let globals = ctx
+                    .top_level
+                    .definitions
+                    .read()
+                    .iter()
+                    .filter_map(|def| {
+                        if let TopLevelDef::Variable { simple_name, ty, .. } = &*def.read() {
+                            Some((*simple_name, *ty))
+                        } else {
+                            None
+                        }
+                    })
+                    .collect_vec();
+
+                if let Some((_, ty)) = globals.iter().find(|(name, _)| name == id) {
+                    let ptr = value
+                        .to_basic_value_enum(ctx, generator, *ty)
+                        .map(BasicValueEnum::into_pointer_value)?;
+
+                    ctx.builder.build_load(ptr, id.to_string().as_str()).map(Into::into).unwrap()
+                } else {
+                    value
+                }
             }
         },
         ExprKind::List { elts, .. } => {

nac3core/src/toplevel/composer.rs

@@ -1,6 +1,6 @@
 use std::rc::Rc;
 
-use nac3parser::ast::{fold::Fold, ExprKind};
+use nac3parser::ast::{fold::Fold, ExprKind, Ident};
 
 use super::*;
 use crate::{
@@ -382,32 +382,66 @@ impl TopLevelComposer {
                 ))
             }
 
+            ast::StmtKind::Assign { .. } => {
+                // Assignment statements can assign to (and therefore create) more than one 
+                // variable, but this function only allows returning one set of symbol information.
+                // We want to avoid changing this to return a `Vec` of symbol info, as this would 
+                // require `iter().next().unwrap()` on every variable created from a non-Assign 
+                // statement.
+                //
+                // Make callers use `register_top_level_var` instead, as it provides more
+                // fine-grained control over which symbols to register, while also simplifying the
+                // usage of this function.
+                panic!("Registration of top-level Assign statements must use TopLevelComposer::register_top_level_var (at {})", ast.location);
+            }
+
             ast::StmtKind::AnnAssign { target, annotation, .. } => {
                 let ExprKind::Name { id: name, .. } = target.node else {
                     return Err(format!(
                         "global variable declaration must be an identifier (at {})",
-                        ast.location
+                        target.location
                     ));
                 };
 
-                if self.keyword_list.contains(&name) {
+                self.register_top_level_var(
-                    return Err(format!(
-                        "cannot use keyword `{}` as a class name (at {})",
                     name,
-                        ast.location
+                    Some(annotation.as_ref().clone()),
-                    ));
+                    resolver,
+                    mod_path,
+                    target.location,
+                )
             }
 
-                let global_var_name = if mod_path.is_empty() {
+            _ => Err(format!(
-                    name.to_string()
+                "registrations of constructs other than top level classes/functions/variables are not supported (at {})",
-                } else {
-                    format!("{mod_path}.{name}")
-                };
-                if !defined_names.insert(global_var_name.clone()) {
-                    return Err(format!(
-                        "global variable `{}` defined twice (at {})",
-                        global_var_name,
                 ast.location
+            )),
+        }
+    }
+
+    /// Registers a top-level variable with the given `name` into the composer.
+    ///
+    /// `annotation` - The type annotation of the top-level variable, or [`None`] if no type
+    /// annotation is provided.
+    /// `location` - The location of the top-level variable.
+    pub fn register_top_level_var(
+        &mut self,
+        name: Ident,
+        annotation: Option<Expr>,
+        resolver: Option<Arc<dyn SymbolResolver + Send + Sync>>,
+        mod_path: &str,
+        location: Location,
+    ) -> Result<(StrRef, DefinitionId, Option<Type>), String> {
+        if self.keyword_list.contains(&name) {
+            return Err(format!("cannot use keyword `{name}` as a class name (at {location})"));
+        }
+
+        let global_var_name =
+            if mod_path.is_empty() { name.to_string() } else { format!("{mod_path}.{name}") };
+
+        if !self.defined_names.insert(global_var_name.clone()) {
+            return Err(format!(
+                "global variable `{global_var_name}` defined twice (at {location})"
             ));
         }
 
@@ -418,25 +452,15 @@ impl TopLevelComposer {
                 name,
                 // dummy here, unify with correct type later,
                 ty_to_be_unified,
-                        *(annotation.clone()),
+                annotation,
                 resolver,
-                        Some(ast.location),
+                Some(location),
-                    )).into(),
+            ))
+            .into(),
             None,
         ));
 
-                Ok((
+        Ok((name, DefinitionId(self.definition_ast_list.len() - 1), Some(ty_to_be_unified)))
-                    name,
-                    DefinitionId(self.definition_ast_list.len() - 1),
-                    Some(ty_to_be_unified),
-                ))
-            }
-
-            _ => Err(format!(
-                "registrations of constructs other than top level classes/functions/variables are not supported (at {})",
-                ast.location
-            )),
-        }
     }
 
     pub fn start_analysis(&mut self, inference: bool) -> Result<(), HashSet<String>> {
@@ -485,7 +509,7 @@ impl TopLevelComposer {
                     // things like `class A(Generic[T, V, ImportedModule.T])` is not supported
                     // i.e. only simple names are allowed in the subscript
                     // should update the TopLevelDef::Class.typevars and the TypeEnum::TObj.params
-                    ast::ExprKind::Subscript { value, slice, .. }
+                    ExprKind::Subscript { value, slice, .. }
                         if {
                             matches!(
                                 &value.node,
@@ -501,9 +525,9 @@ impl TopLevelComposer {
                         }
                         is_generic = true;
 
-                        let type_var_list: Vec<&ast::Expr<()>>;
+                        let type_var_list: Vec<&Expr<()>>;
                         // if `class A(Generic[T, V, G])`
-                        if let ast::ExprKind::Tuple { elts, .. } = &slice.node {
+                        if let ExprKind::Tuple { elts, .. } = &slice.node {
                             type_var_list = elts.iter().collect_vec();
                         // `class A(Generic[T])`
                         } else {
@@ -1014,15 +1038,15 @@ impl TopLevelComposer {
                     }
                 }
 
-                let arg_with_default: Vec<(&ast::Located<ast::ArgData<()>>, Option<&ast::Expr>)> =
+                let arg_with_default: Vec<(&ast::Located<ast::ArgData<()>>, Option<&Expr>)> = args
-                    args.args
+                    .args
                     .iter()
                     .rev()
                     .zip(
                         args.defaults
                             .iter()
                             .rev()
-                                .map(|x| -> Option<&ast::Expr> { Some(x) })
+                            .map(|x| -> Option<&Expr> { Some(x) })
                             .chain(std::iter::repeat(None)),
                     )
                     .collect_vec();
@@ -1283,7 +1307,7 @@ impl TopLevelComposer {
 
                         let arg_with_default: Vec<(
                             &ast::Located<ast::ArgData<()>>,
-                            Option<&ast::Expr>,
+                            Option<&Expr>,
                         )> = args
                             .args
                             .iter()
@@ -1292,7 +1316,7 @@ impl TopLevelComposer {
                                 args.defaults
                                     .iter()
                                     .rev()
-                                    .map(|x| -> Option<&ast::Expr> { Some(x) })
+                                    .map(|x| -> Option<&Expr> { Some(x) })
                                     .chain(std::iter::repeat(None)),
                             )
                             .collect_vec();
@@ -1449,7 +1473,7 @@ impl TopLevelComposer {
                         .map_err(|e| HashSet::from([e.to_display(unifier).to_string()]))?;
                 }
                 ast::StmtKind::AnnAssign { target, annotation, value, .. } => {
-                    if let ast::ExprKind::Name { id: attr, .. } = &target.node {
+                    if let ExprKind::Name { id: attr, .. } = &target.node {
                         if defined_fields.insert(attr.to_string()) {
                             let dummy_field_type = unifier.get_dummy_var().ty;
 
@@ -1457,7 +1481,7 @@ impl TopLevelComposer {
                                 None => {
                                     // handle Kernel[T], KernelInvariant[T]
                                     let (annotation, mutable) = match &annotation.node {
-                                        ast::ExprKind::Subscript { value, slice, .. }
+                                        ExprKind::Subscript { value, slice, .. }
                                             if matches!(
                                                 &value.node,
                                                 ast::ExprKind::Name { id, .. } if id == &core_config.kernel_invariant_ann.into()
@@ -1465,7 +1489,7 @@ impl TopLevelComposer {
                                         {
                                             (slice, false)
                                         }
-                                        ast::ExprKind::Subscript { value, slice, .. }
+                                        ExprKind::Subscript { value, slice, .. }
                                             if matches!(
                                                 &value.node,
                                                 ast::ExprKind::Name { id, .. } if core_config.kernel_ann.map_or(false, |c| id == &c.into())
@@ -1483,13 +1507,13 @@ impl TopLevelComposer {
                                 Some(boxed_expr) => {
                                     // Class attributes are set as immutable regardless
                                     let (annotation, _) = match &annotation.node {
-                                        ast::ExprKind::Subscript { slice, .. } => (slice, false),
+                                        ExprKind::Subscript { slice, .. } => (slice, false),
                                         _ if core_config.kernel_ann.is_none() => (annotation, false),
                                         _ => continue,
                                     };
 
                                     match &**boxed_expr {
-                                        ast::Located {location: _, custom: (), node: ast::ExprKind::Constant { value: v, kind: _ }} => {
+                                        ast::Located {location: _, custom: (), node: ExprKind::Constant { value: v, kind: _ }} => {
                                             // Restricting the types allowed to be defined as class attributes
                                             match v {
                                                 ast::Constant::Bool(_) | ast::Constant::Str(_) | ast::Constant::Int(_) | ast::Constant::Float(_) => {}
@@ -1937,20 +1961,20 @@ impl TopLevelComposer {
             if ast.is_none() {
                 return Ok(());
             }
-            let mut function_def = def.write();
+
-            if let TopLevelDef::Function {
+            let (name, simple_name, signature, resolver) = {
-                instance_to_stmt,
+                let function_def = def.read();
-                instance_to_symbol,
+                let TopLevelDef::Function { name, simple_name, signature, resolver, .. } =
-                name,
+                    &*function_def
-                simple_name,
+                else {
-                signature,
+                    return Ok(());
-                resolver,
+                };
-                ..
+
-            } = &mut *function_def
+                (name.clone(), *simple_name, *signature, resolver.clone())
-            {
+            };
-                let signature_ty_enum = unifier.get_ty(*signature);
+
-                let TypeEnum::TFunc(FunSignature { args, ret, vars, .. }) =
+            let signature_ty_enum = unifier.get_ty(signature);
-                    signature_ty_enum.as_ref()
+            let TypeEnum::TFunc(FunSignature { args, ret, vars, .. }) = signature_ty_enum.as_ref()
             else {
                 unreachable!("must be typeenum::tfunc")
             };
@@ -2062,8 +2086,7 @@ impl TopLevelComposer {
                     if self_type.is_some() {
                         result.insert("self".into(), IdentifierInfo::default());
                     }
-                        result
+                    result.extend(inst_args.iter().map(|x| (x.name, IdentifierInfo::default())));
-                            .extend(inst_args.iter().map(|x| (x.name, IdentifierInfo::default())));
                     result
                 };
                 let mut calls: HashMap<CodeLocation, CallId> = HashMap::new();
@@ -2100,33 +2123,43 @@ impl TopLevelComposer {
                 else {
                     unreachable!("must be function def ast")
                 };
-                    if !decorator_list.is_empty()
+
-                        && matches!(&decorator_list[0].node,
-                            ast::ExprKind::Name{ id, .. } if id == &"extern".into())
-                    {
-                        instance_to_symbol.insert(String::new(), simple_name.to_string());
-                        continue;
-                    }
-                    if !decorator_list.is_empty()
-                        && matches!(&decorator_list[0].node,
-                            ast::ExprKind::Name{ id, .. } if id == &"rpc".into())
-                    {
-                        instance_to_symbol.insert(String::new(), simple_name.to_string());
-                        continue;
-                    }
                 if !decorator_list.is_empty() {
-                        if let ast::ExprKind::Call { func, .. } = &decorator_list[0].node {
+                    if matches!(&decorator_list[0].node, ExprKind::Name { id, .. } if id == &"extern".into())
-                            if matches!(&func.node,
-                                ast::ExprKind::Name{ id, .. } if id == &"rpc".into())
                     {
+                        let TopLevelDef::Function { instance_to_symbol, .. } = &mut *def.write()
+                        else {
+                            unreachable!()
+                        };
+                        instance_to_symbol.insert(String::new(), simple_name.to_string());
+                        continue;
+                    }
+
+                    if matches!(&decorator_list[0].node, ExprKind::Name { id, .. } if id == &"rpc".into())
+                    {
+                        let TopLevelDef::Function { instance_to_symbol, .. } = &mut *def.write()
+                        else {
+                            unreachable!()
+                        };
+                        instance_to_symbol.insert(String::new(), simple_name.to_string());
+                        continue;
+                    }
+
+                    if let ExprKind::Call { func, .. } = &decorator_list[0].node {
+                        if matches!(&func.node, ExprKind::Name { id, .. } if id == &"rpc".into()) {
+                            let TopLevelDef::Function { instance_to_symbol, .. } =
+                                &mut *def.write()
+                            else {
+                                unreachable!()
+                            };
                             instance_to_symbol.insert(String::new(), simple_name.to_string());
                             continue;
                         }
                     }
                 }
 
-                    let fun_body = body
+                let fun_body =
-                        .into_iter()
+                    body.into_iter()
                         .map(|b| inferencer.fold_stmt(b))
                         .collect::<Result<Vec<_>, _>>()?;
 
@@ -2196,6 +2229,9 @@ impl TopLevelComposer {
                     )]));
                 }
 
+                let TopLevelDef::Function { instance_to_stmt, .. } = &mut *def.write() else {
+                    unreachable!()
+                };
                 instance_to_stmt.insert(
                     get_subst_key(
                         unifier,
@@ -2211,10 +2247,10 @@ impl TopLevelComposer {
                     },
                 );
             }
-            }
 
             Ok(())
         };
+
         for (id, (def, ast)) in self.definition_ast_list.iter().enumerate().skip(self.builtin_num) {
             if ast.is_none() {
                 continue;
@@ -2237,9 +2273,8 @@ impl TopLevelComposer {
         let primitives_store = &self.primitives_ty;
 
         let mut analyze = |variable_def: &Arc<RwLock<TopLevelDef>>| -> Result<_, HashSet<String>> {
-            let variable_def = &mut *variable_def.write();
+            let TopLevelDef::Variable { ty: dummy_ty, ty_decl, resolver, loc, .. } =
-
+                &*variable_def.read()
-            let TopLevelDef::Variable { ty: dummy_ty, ty_decl, resolver, loc, .. } = variable_def
             else {
                 // not top level variable def, skip
                 return Ok(());
@@ -2247,6 +2282,7 @@ impl TopLevelComposer {
 
             let resolver = &**resolver.as_ref().unwrap();
 
+            if let Some(ty_decl) = ty_decl {
                 let ty_annotation = parse_ast_to_type_annotation_kinds(
                     resolver,
                     &temp_def_list,
@@ -2266,6 +2302,8 @@ impl TopLevelComposer {
                 unifier.unify(*dummy_ty, ty_from_ty_annotation).map_err(|e| {
                     HashSet::from([e.at(Some(loc.unwrap())).to_display(unifier).to_string()])
                 })?;
+            }
+
             Ok(())
         };
 

nac3core/src/toplevel/helper.rs

@@ -600,7 +600,7 @@ impl TopLevelComposer {
         name: String,
         simple_name: StrRef,
         ty: Type,
-        ty_decl: Expr,
+        ty_decl: Option<Expr>,
         resolver: Option<Arc<dyn SymbolResolver + Send + Sync>>,
         loc: Option<Location>,
     ) -> TopLevelDef {

nac3core/src/toplevel/mod.rs

@@ -158,8 +158,8 @@ pub enum TopLevelDef {
         /// Type of the global variable.
         ty: Type,
 
-        /// The declared type of the global variable.
+        /// The declared type of the global variable, or [`None`] if no type annotation is provided.
-        ty_decl: Expr,
+        ty_decl: Option<Expr>,
 
         /// Symbol resolver of the module defined the class.
         resolver: Option<Arc<dyn SymbolResolver + Send + Sync>>,

nac3core/src/typecheck/function_check.rs

@@ -10,7 +10,7 @@ use nac3parser::ast::{
 };
 
 use super::{
-    type_inferencer::{IdentifierInfo, Inferencer},
+    type_inferencer::{DeclarationSource, IdentifierInfo, Inferencer},
     typedef::{Type, TypeEnum},
 };
 use crate::toplevel::helper::PrimDef;
@@ -34,6 +34,20 @@ impl<'a> Inferencer<'a> {
                 Err(HashSet::from([format!("cannot assign to a `none` (at {})", pattern.location)]))
             }
             ExprKind::Name { id, .. } => {
+                // If `id` refers to a declared symbol, reject this assignment if it is used in the
+                // context of an (implicit) global variable
+                if let Some(id_info) = defined_identifiers.get(id) {
+                    if matches!(
+                        id_info.source,
+                        DeclarationSource::Global { is_explicit: Some(false) }
+                    ) {
+                        return Err(HashSet::from([format!(
+                            "cannot access local variable '{id}' before it is declared (at {})",
+                            pattern.location
+                        )]));
+                    }
+                }
+
                 if !defined_identifiers.contains_key(id) {
                     defined_identifiers.insert(*id, IdentifierInfo::default());
                 }
@@ -104,7 +118,22 @@ impl<'a> Inferencer<'a> {
                         *id,
                     ) {
                         Ok(_) => {
-                            self.defined_identifiers.insert(*id, IdentifierInfo::default());
+                            let is_global = self.is_id_global(*id);
+
+                            defined_identifiers.insert(
+                                *id,
+                                IdentifierInfo {
+                                    source: match is_global {
+                                        Some(true) => {
+                                            DeclarationSource::Global { is_explicit: Some(false) }
+                                        }
+                                        Some(false) => {
+                                            DeclarationSource::Global { is_explicit: None }
+                                        }
+                                        None => DeclarationSource::Local,
+                                    },
+                                },
+                            );
                         }
                         Err(e) => {
                             return Err(HashSet::from([format!(
@@ -368,9 +397,9 @@ impl<'a> Inferencer<'a> {
             StmtKind::Global { names, .. } => {
                 for id in names {
                     if let Some(id_info) = defined_identifiers.get(id) {
-                        if !id_info.is_global {
+                        if id_info.source == DeclarationSource::Local {
                             return Err(HashSet::from([format!(
-                                "name '{id}' is assigned to before global declaration at {}",
+                                "name '{id}' is referenced prior to global declaration at {}",
                                 stmt.location,
                             )]));
                         }
@@ -385,8 +414,12 @@ impl<'a> Inferencer<'a> {
                         *id,
                     ) {
                         Ok(_) => {
-                            self.defined_identifiers
+                            defined_identifiers.insert(
-                                .insert(*id, IdentifierInfo { is_global: true });
+                                *id,
+                                IdentifierInfo {
+                                    source: DeclarationSource::Global { is_explicit: Some(true) },
+                                },
+                            );
                         }
                         Err(e) => {
                             return Err(HashSet::from([format!(

nac3core/src/typecheck/type_inferencer/mod.rs

@@ -12,7 +12,7 @@ use itertools::{izip, Itertools};
 use nac3parser::ast::{
     self,
     fold::{self, Fold},
-    Arguments, Comprehension, ExprContext, ExprKind, Located, Location, StrRef,
+    Arguments, Comprehension, ExprContext, ExprKind, Ident, Located, Location, StrRef,
 };
 
 use super::{
@@ -88,11 +88,31 @@ impl PrimitiveStore {
     }
 }
 
+/// The location where an identifier declaration refers to.
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub enum DeclarationSource {
+    /// Local scope.
+    Local,
+
+    /// Global scope.
+    Global {
+        /// Whether the identifier is declared by the use of `global` statement. This field is
+        /// [`None`] if the identifier does not refer to a variable.
+        is_explicit: Option<bool>,
+    },
+}
+
 /// Information regarding a defined identifier.
-#[derive(Clone, Copy, Debug, Default)]
+#[derive(Clone, Copy, Debug)]
 pub struct IdentifierInfo {
     /// Whether this identifier refers to a global variable.
-    pub is_global: bool,
+    pub source: DeclarationSource,
+}
+
+impl Default for IdentifierInfo {
+    fn default() -> Self {
+        IdentifierInfo { source: DeclarationSource::Local }
+    }
 }
 
 impl IdentifierInfo {
@@ -574,7 +594,22 @@ impl<'a> Fold<()> for Inferencer<'a> {
                             *id,
                         ) {
                             Ok(_) => {
-                                self.defined_identifiers.insert(*id, IdentifierInfo::default());
+                                let is_global = self.is_id_global(*id);
+
+                                self.defined_identifiers.insert(
+                                    *id,
+                                    IdentifierInfo {
+                                        source: match is_global {
+                                            Some(true) => DeclarationSource::Global {
+                                                is_explicit: Some(false),
+                                            },
+                                            Some(false) => {
+                                                DeclarationSource::Global { is_explicit: None }
+                                            }
+                                            None => DeclarationSource::Local,
+                                        },
+                                    },
+                                );
                             }
                             Err(e) => {
                                 return report_error(
@@ -2650,4 +2685,22 @@ impl<'a> Inferencer<'a> {
         self.constrain(body.custom.unwrap(), orelse.custom.unwrap(), &body.location)?;
         Ok(body.custom.unwrap())
     }
+
+    /// Determines whether the given `id` refers to a global symbol.
+    ///
+    /// Returns `Some(true)` if `id` refers to a global variable, `Some(false)` if `id` refers to a
+    /// class/function, and `None` if `id` refers to a local symbol.
+    pub(super) fn is_id_global(&self, id: Ident) -> Option<bool> {
+        self.top_level
+            .definitions
+            .read()
+            .iter()
+            .map(|def| match *def.read() {
+                TopLevelDef::Class { name, .. } => (name, false),
+                TopLevelDef::Function { simple_name, .. } => (simple_name, false),
+                TopLevelDef::Variable { simple_name, .. } => (simple_name, true),
+            })
+            .find(|(global, _)| global == &id)
+            .map(|(_, has_explicit_prop)| has_explicit_prop)
+    }
 }

nac3standalone/demo/src/globals.py

@@ -7,7 +7,7 @@ def output_int64(x: int64):
     ...
 
 X: int32 = 0
-Y: int64 = int64(1)
+Y = int64(1)
 
 def f():
     global X, Y

nac3standalone/src/main.rs

@@ -174,46 +174,49 @@ fn handle_typevar_definition(
 fn handle_assignment_pattern(
     targets: &[Expr],
     value: &Expr,
-    resolver: &(dyn SymbolResolver + Send + Sync),
+    resolver: Arc<dyn SymbolResolver + Send + Sync>,
     internal_resolver: &ResolverInternal,
-    def_list: &[Arc<RwLock<TopLevelDef>>],
+    composer: &mut TopLevelComposer,
-    unifier: &mut Unifier,
-    primitives: &PrimitiveStore,
 ) -> Result<(), String> {
     if targets.len() == 1 {
-        match &targets[0].node {
+        let target = &targets[0];
+
+        match &target.node {
             ExprKind::Name { id, .. } => {
+                let def_list = composer.extract_def_list();
+                let unifier = &mut composer.unifier;
+                let primitives = &composer.primitives_ty;
+
                 if let Ok(var) =
-                    handle_typevar_definition(value, resolver, def_list, unifier, primitives)
+                    handle_typevar_definition(value, &*resolver, &def_list, unifier, primitives)
                 {
                     internal_resolver.add_id_type(*id, var);
                     Ok(())
-                } else if let Ok(val) = parse_parameter_default_value(value, resolver) {
+                } else if let Ok(val) = parse_parameter_default_value(value, &*resolver) {
                     internal_resolver.add_module_global(*id, val);
+                    let (name, def_id, _) = composer
+                        .register_top_level_var(
+                            *id,
+                            None,
+                            Some(resolver.clone()),
+                            "__main__",
+                            target.location,
+                        )
+                        .unwrap();
+                    internal_resolver.add_id_def(name, def_id);
                     Ok(())
                 } else {
                     Err(format!("fails to evaluate this expression `{:?}` as a constant or generic parameter at {}",
-                        targets[0].node,
+                        target.node,
-                        targets[0].location,
+                        target.location,
                     ))
                 }
             }
             ExprKind::List { elts, .. } | ExprKind::Tuple { elts, .. } => {
-                handle_assignment_pattern(
+                handle_assignment_pattern(elts, value, resolver, internal_resolver, composer)?;
-                    elts,
-                    value,
-                    resolver,
-                    internal_resolver,
-                    def_list,
-                    unifier,
-                    primitives,
-                )?;
                 Ok(())
             }
-            _ => Err(format!(
+            _ => Err(format!("assignment to {target:?} is not supported at {}", target.location)),
-                "assignment to {:?} is not supported at {}",
-                targets[0], targets[0].location
-            )),
         }
     } else {
         match &value.node {
@@ -223,11 +226,9 @@ fn handle_assignment_pattern(
                         handle_assignment_pattern(
                             std::slice::from_ref(tar),
                             val,
-                            resolver,
+                            resolver.clone(),
                             internal_resolver,
-                            def_list,
+                            composer,
-                            unifier,
-                            primitives,
                         )?;
                     }
                     Ok(())
@@ -248,8 +249,9 @@ fn handle_assignment_pattern(
 fn handle_global_var(
     target: &Expr,
     value: Option<&Expr>,
-    resolver: &(dyn SymbolResolver + Send + Sync),
+    resolver: &Arc<dyn SymbolResolver + Send + Sync>,
     internal_resolver: &ResolverInternal,
+    composer: &mut TopLevelComposer,
 ) -> Result<(), String> {
     let ExprKind::Name { id, .. } = target.node else {
         return Err(format!(
@@ -262,8 +264,12 @@ fn handle_global_var(
         return Err(format!("global variable `{id}` must be initialized in its definition"));
     };
 
-    if let Ok(val) = parse_parameter_default_value(value, resolver) {
+    if let Ok(val) = parse_parameter_default_value(value, &**resolver) {
         internal_resolver.add_module_global(id, val);
+        let (name, def_id, _) = composer
+            .register_top_level_var(id, None, Some(resolver.clone()), "__main__", target.location)
+            .unwrap();
+        internal_resolver.add_id_def(name, def_id);
         Ok(())
     } else {
         Err(format!(
@@ -355,17 +361,12 @@ fn main() {
     for stmt in parser_result {
         match &stmt.node {
             StmtKind::Assign { targets, value, .. } => {
-                let def_list = composer.extract_def_list();
-                let unifier = &mut composer.unifier;
-                let primitives = &composer.primitives_ty;
                 if let Err(err) = handle_assignment_pattern(
                     targets,
                     value,
-                    resolver.as_ref(),
+                    resolver.clone(),
                     internal_resolver.as_ref(),
-                    &def_list,
+                    &mut composer,
-                    unifier,
-                    primitives,
                 ) {
                     panic!("{err}");
                 }
@@ -375,16 +376,12 @@ fn main() {
                 if let Err(err) = handle_global_var(
                     target,
                     value.as_ref().map(Box::as_ref),
-                    resolver.as_ref(),
+                    &resolver,
                     internal_resolver.as_ref(),
+                    &mut composer,
                 ) {
                     panic!("{err}");
                 }
-
-                let (name, def_id, _) = composer
-                    .register_top_level(stmt, Some(resolver.clone()), "__main__", true)
-                    .unwrap();
-                internal_resolver.add_id_def(name, def_id);
             }
 
             // allow (and ignore) "from __future__ import annotations"