[clang][Interp] Ignore FunctionDecls in compound statements

Author: tbaederr

clang/lib/AST/Interp/ByteCodeStmtGen.cpp

@@ -332,7 +332,8 @@ bool ByteCodeStmtGen<Emitter>::visitCompoundStmt(
 template <class Emitter>
 bool ByteCodeStmtGen<Emitter>::visitDeclStmt(const DeclStmt *DS) {
   for (auto *D : DS->decls()) {
-    if (isa<StaticAssertDecl, TagDecl, TypedefNameDecl, UsingEnumDecl>(D))
+    if (isa<StaticAssertDecl, TagDecl, TypedefNameDecl, UsingEnumDecl,
+            FunctionDecl>(D))
       continue;
 
     const auto *VD = dyn_cast<VarDecl>(D);

clang/test/AST/Interp/functions.cpp

@@ -601,3 +601,13 @@ namespace FromIntegral {
                                            // both-warning {{variable length arrays}}
 #endif
 }
+
+namespace {
+  template <typename T> using id = T;
+  template <typename T>
+  constexpr void g() {
+    constexpr id<void (T)> f;
+  }
+
+  static_assert((g<int>(), true), "");
+}