Merge pull request #2463 from 9rnsr/fix4481

Issue 4481 - ICE(glue.c,!vthis->csym) or compiles, depending on the import statements order

src/glue.c

@@ -792,7 +792,6 @@ void FuncDeclaration::toObjFile(int multiobj)
 
     if (vthis)
     {
-        assert(!vthis->csym);
         sthis = vthis->toSymbol();
         irs.sthis = sthis;
         if (!(f->Fflags3 & Fnested))

test/compilable/ice4481.d

@@ -0,0 +1,5 @@
+// EXTRA_SOURCES: imports/b4481.d
+import imports.a4481;
+import imports.b4481;
+
+void main() {}

test/compilable/imports/a4481.d

@@ -0,0 +1,9 @@
+module imports.a4481;
+
+template reduce(alias pred)
+{
+    auto reduce(R)(R range)
+    {
+        return pred(range[0]);
+    }
+}

test/compilable/imports/b4481.d

@@ -0,0 +1,14 @@
+module imports.b4481;
+
+import imports.a4481;
+
+class Font
+{
+public:
+    int charHeight(dchar c) { return 0; }
+    int textHeight(in string text)
+    {
+        auto maxHeight = (dchar ch) { return charHeight(ch); };
+        return reduce!(maxHeight)(text);
+    }
+}