fix Issue 10980 - static initialization of immutable structs with dis…

…abled postblit fails

src/declaration.c

@@ -1657,28 +1657,17 @@ void VarDeclaration::semantic(Scope *sc)
                      * because the postblit doesn't get run on the initialization of w.
                      */
                     if (ti->ty == Tstruct)
-                    {   StructDeclaration *sd = ((TypeStruct *)ti)->sym;
+                    {
+                        StructDeclaration *sd = ((TypeStruct *)ti)->sym;
                         /* Look to see if initializer involves a copy constructor
                          * (which implies a postblit)
                          */
                         if (sd->cpctor &&               // there is a copy constructor
-                            tb->equals(ti))             // rvalue is the same struct
+                            tb->toDsymbol(NULL) == sd)  // exp is the same struct
                         {
                             // The only allowable initializer is a (non-copy) constructor
-                            if (exp->op == TOKcall)
-                            {
-                                CallExp *ce = (CallExp *)exp;
-                                if (ce->e1->op == TOKdotvar)
-                                {
-                                    DotVarExp *dve = (DotVarExp *)ce->e1;
-                                    if (dve->var->isCtorDeclaration())
-                                        goto LNoCopyConstruction;
-                                }
-                            }
-                            error("of type struct %s uses this(this), which is not allowed in static initialization", tb->toChars());
-
-                          LNoCopyConstruction:
-                            ;
+                            if (exp->isLvalue())
+                                error("of type struct %s uses this(this), which is not allowed in static initialization", tb->toChars());
                         }
                     }
                     ei->exp = exp;

test/fail_compilation/fail10980.d

@@ -0,0 +1,44 @@
+/*
+TEST_OUTPUT:
+---
+fail_compilation/fail10980.d(22): Error: variable fail10980.s1b of type struct immutable(S1) uses this(this), which is not allowed in static initialization
+fail_compilation/fail10980.d(28): Error: variable fail10980.s1d of type struct immutable(S1) uses this(this), which is not allowed in static initialization
+fail_compilation/fail10980.d(27): Error: static variable s1x cannot be read at compile time
+fail_compilation/fail10980.d(28):        called from here: bar1()
+fail_compilation/fail10980.d(38): Error: variable fail10980.s2b of type struct immutable(S2) uses this(this), which is not allowed in static initialization
+fail_compilation/fail10980.d(44): Error: variable fail10980.s2d of type struct immutable(S2) uses this(this), which is not allowed in static initialization
+fail_compilation/fail10980.d(43): Error: static variable s2x cannot be read at compile time
+fail_compilation/fail10980.d(44):        called from here: bar2()
+---
+*/
+
+struct S1
+{
+    this(int) immutable {}
+    this(this) {}
+}
+alias immutable(S1) IS1;
+static immutable S1 s1a = IS1(1);   // OK
+static immutable S1 s1b = s1a;      // NG
+
+S1 foo1() { S1 s1x; S1 s1y = s1x; return s1y; }
+static immutable S1 s1c = foo1();   // OK
+
+ref S1 bar1() { static S1 s1x; return s1x; }
+static immutable S1 s1d = bar1();   // NG
+
+
+struct S2
+{
+    int val;
+    this(this) {}
+}
+alias immutable(S2) IS2;
+static immutable S2 s2a = IS2(1);   // OK
+static immutable S2 s2b = s2a;      // NG
+
+S2 foo2() { S2 s2x; S2 s2y = s2x; return s2y; }
+static immutable S2 s2c = foo2();   // OK
+
+ref S2 bar2() { static S2 s2x; return s2x; }
+static immutable S2 s2d = bar2();   // NG