d: Merge upstream dmd c2274e56a (PR96250).

1. Fixes an ICE in the front-end if a struct symbol were to appear twice
in the compilation unit.

2. Fixes a rejects-valid bug in the front-end where `(symbol)' was being
resolved as a `var' expression, instead of `this.var'.

Reviewed-on: https://github.com/dlang/dmd/pull/11436
	     https://github.com/dlang/dmd/pull/11439

gcc/d/ChangeLog:

	PR d/96250
	* dmd/MERGE: Merge upstream dmd c2274e56a.

4 files changed, 19 insertions, 3 deletions

diff --git a/gcc/d/dmd/MERGE b/gcc/d/dmd/MERGE
index b99e9f3..daa3e56 100644
--- a/gcc/d/dmd/MERGE
+++ b/gcc/d/dmd/MERGE
@@ -1,4 +1,4 @@
-8508c4e683f065eb3deab76b610f7fecb3258a8e
+c2274e56a3220ea636c6199fd06cd54fcdf6bad9
 
 The first line of this file holds the git revision number of the last
 merge done from the dlang/dmd repository.
diff --git a/gcc/d/dmd/dstruct.c b/gcc/d/dmd/dstruct.c
index 86bb6c8..2b87154 100644
--- a/gcc/d/dmd/dstruct.c
+++ b/gcc/d/dmd/dstruct.c
@@ -1206,6 +1206,13 @@ void StructDeclaration::semantic(Scope *sc)
         }
     }
 
+    if (type->ty == Tstruct && ((TypeStruct *)type)->sym != this)
+    {
+        // https://issues.dlang.org/show_bug.cgi?id=19024
+        StructDeclaration *sd = ((TypeStruct *)type)->sym;
+        error("already exists at %s. Perhaps in another function with the same name?", sd->loc.toChars());
+    }
+
     if (global.errors != errors)
     {
         // The type is no good.
@@ -1220,8 +1227,6 @@ void StructDeclaration::semantic(Scope *sc)
         deferred->semantic2(sc);
         deferred->semantic3(sc);
     }
-
-    assert(type->ty != Tstruct || ((TypeStruct *)type)->sym == this);
 }
 
 Dsymbol *StructDeclaration::search(const Loc &loc, Identifier *ident, int flags)
diff --git a/gcc/d/dmd/expressionsem.c b/gcc/d/dmd/expressionsem.c
index ac6b5bc..9f21dab 100644
--- a/gcc/d/dmd/expressionsem.c
+++ b/gcc/d/dmd/expressionsem.c
@@ -812,6 +812,16 @@ public:
         exp->type->resolve(exp->loc, sc, &e, &t, &s, true);
         if (e)
         {
+            // `(Type)` is actually `(var)` so if `(var)` is a member requiring `this`
+            // then rewrite as `(this.var)` in case it would be followed by a DotVar
+            // to fix https://issues.dlang.org/show_bug.cgi?id=9490
+            VarExp *ve = e->isVarExp();
+            if (ve && ve->var && exp->parens && !ve->var->isStatic() && !(sc->stc & STCstatic) &&
+                sc->func && sc->func->needThis() && ve->var->toParent2()->isAggregateDeclaration())
+            {
+                // printf("apply fix for issue 9490: add `this.` to `%s`...\n", e->toChars());
+                e = new DotVarExp(exp->loc, new ThisExp(exp->loc), ve->var, false);
+            }
             //printf("e = %s %s\n", Token::toChars(e->op), e->toChars());
             e = semantic(e, sc);
         }
diff --git a/gcc/d/dmd/parse.c b/gcc/d/dmd/parse.c
index f4cd28e..d1017ac 100644
--- a/gcc/d/dmd/parse.c
+++ b/gcc/d/dmd/parse.c
@@ -7531,6 +7531,7 @@ Expression *Parser::parseUnaryExp()
                                 return NULL;
                             }
                             e = new TypeExp(loc, t);
+                            e->parens = 1;
                             e = parsePostExp(e);
                         }
                         else