Fix associated type resolution bug. (#2719)

* Fix associated type resolution bug.

* Fix.

* Fix language server hinting messed up by breadcrumb nodes.

---------

Co-authored-by: Yong He <yhe@nvidia.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/source/slang/slang-ast-type.cpp b/source/slang/slang-ast-type.cpp
index 362503a64..fdbd56377 100644
--- a/source/slang/slang-ast-type.cpp
+++ b/source/slang/slang-ast-type.cpp
@@ -208,8 +208,19 @@ Val* DeclRefType::_substituteImplOverride(ASTBuilder* astBuilder, SubstitutionSe
     if (auto genericTypeParamDecl = as<GenericTypeParamDecl>(declRef.getDecl()))
     {
         if (auto result = maybeSubstituteGenericParam(this, genericTypeParamDecl, subst, ioDiff))
+        {
+            if (auto substDeclRefType = as<DeclRefType>(result))
+            {
+                // After generic substitution, we may be able to further simplify
+                // by looking up the actual type of an associated type.
+                if (auto satisfyingVal = _tryLookupConcreteAssociatedTypeFromThisTypeSubst(
+                        astBuilder, substDeclRefType->declRef))
+                    return satisfyingVal;
+            }
             return result;
+        }
     }
+
     int diff = 0;
     DeclRef<Decl> substDeclRef = declRef.substituteImpl(astBuilder, subst, &diff);