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nac3core/type_inferencer: avoid type var for assign

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pca006132 2021-09-22 19:25:47 +08:00
parent 105d605e6d
commit 799ed58d21
1 changed files with 44 additions and 0 deletions
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44
nac3core/src/typecheck/type_inferencer/mod.rs
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@ -107,6 +107,50 @@ impl<'a> fold::Fold<()> for Inferencer<'a> {
fold::fold_stmt(self, node)?
}
ast::StmtKind::Assign { ref targets, .. } => {
if targets.iter().all(|t| matches!(t.node, ast::ExprKind::Name { .. })) {
if let ast::StmtKind::Assign { targets, value, .. } = node.node {
let value = self.fold_expr(*value)?;
let value_ty = value.custom.unwrap();
let targets: Result<Vec<_>, _> = targets.into_iter().map(|target| {
if let ast::ExprKind::Name { id, ctx } = target.node {
self.defined_identifiers.insert(id);
let target_ty = if let Some(ty) = self.variable_mapping.get(&id) {
*ty
} else {
let unifier = &mut self.unifier;
self
.function_data
.resolver
.get_symbol_type(unifier, self.primitives, id)
.unwrap_or_else(|| {
self.variable_mapping.insert(id, value_ty);
value_ty
})
};
let location = target.location;
self.unifier.unify(value_ty, target_ty).map(|_| Located {
location,
node: ast::ExprKind::Name { id, ctx },
custom: Some(target_ty)
})
} else {
unreachable!()
}
}).collect();
let targets = targets?;
return Ok(Located {
location: node.location,
node: ast::StmtKind::Assign {
targets,
value: Box::new(value),
type_comment: None,
},
custom: None
});
} else {
unreachable!()
}
}
for target in targets {
self.infer_pattern(target)?;
}