compiler: support package test runtime aliases

cmd/wcc/ww.h

@@ -379,6 +379,8 @@ struct Parser {
 				 * bare-main rule stay intact), and the in-file
 				 * `package` clause asserts (leaf == last
 				 * component) instead of overwriting curmod. */
+	const char *testmodule;	/* hidden package-driver alias for toolchain
+				 * `package test`; NULL outside that compile */
 };
 
 void	parserinit(Parser*, Arena*, Lex*);
@@ -588,9 +590,10 @@ struct Checker {
 	int	errs;
 	int	is_test;	/* #15: `w6c -T` — collect @test fns + synth
 				 * the entry; loud-reject a user main. */
+	const char *test_module;	/* generated dispatcher support qualifier */
 	int	sep_mode;	/* -c package compilation: imported interfaces are
 				 * present, so absent members are hard export errors. */
-	Node	*synth_test_run;	/* exact compiler-generated test.run DOT;
+	Node	*synth_test_run;	/* exact compiler-generated support.run DOT;
 				 * its unresolved external hook is intentional */
 	Node	*alloc_octx;	/* #3/B': the one empty `alloc([], n)` call node
 				 * that has let-declared slice context this walk;