fix Issue 15667 - dmd infinite loop on invalid syntax

src/dmodule.d

@@ -987,7 +987,7 @@ public:
         for (size_t i = 0; i < members.dim; i++)
         {
             Dsymbol s = (*members)[i];
-            //printf("\tModule('%s'): '%s'.semantic()\n", toChars(), s->toChars());
+            //printf("\tModule('%s'): '%s'.semantic()\n", toChars(), s.toChars());
             s.semantic(sc);
             runDeferredSemantic();
         }

src/parse.d

@@ -3277,7 +3277,7 @@ public:
             break;
         default:
             error("basic type expected, not %s", token.toChars());
-            t = Type.tint32;
+            t = Type.terror;
             break;
         }
         return t;

test/fail_compilation/fail15667.d

@@ -0,0 +1,13 @@
+// REQUIRED_ARGS: -o-
+/*
+TEST_OUTPUT:
+---
+fail_compilation/imports/a15667.d(16): Error: basic type expected, not ;
+fail_compilation/imports/a15667.d(19): Error: declaration expected following attribute, not EOF
+---
+*/
+
+void main()
+{
+    import imports.a15667;
+}

test/fail_compilation/imports/a15667.d

@@ -0,0 +1,18 @@
+module imports.a15667;
+
+template staticIndexOf(T)
+{
+    enum staticIndexOf = genericIndexOf!T;
+}
+
+template genericIndexOf(args...)
+{
+    alias e     = args;
+    alias tuple = args;
+    alias tail = tuple;
+    enum next  = genericIndexOf!(e, tail);
+}
+
+alias X = ;
+
+static if (staticIndexOf!X)