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Handle instantiations where some type parameters remain parameters (eg. derived typedefs).

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This commit is contained in:
Graydon Hoare 2011-02-10 11:30:29 -08:00
parent c4a56f7368
commit 3d63aa14e0
1 changed files with 5 additions and 1 deletions
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6
src/comp/middle/typeck.rs
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@ -86,7 +86,11 @@ fn ast_ty_to_ty(ty_getter getter, &@ast.ty ast_ty) -> @ty.t {
fn fold_simple_ty(@ty.t t) -> @ty.t {
alt (t.struct) {
case (ty.ty_param(?param_def)) {
ret param_map.get(param_def);
if (param_map.contains_key(param_def)) {
ret param_map.get(param_def);
} else {
ret t;
}
}
case (_) {
ret t;