ww imports: reject init bindings before recovery

cmd/wcc/parse.c

@@ -1323,6 +1323,12 @@ parseuse(Parser *p)
 	Pos pp = p->cur.pos;
 	expect(p, TK_USE);
 	Node *n = newnode(p->a, N_USE, pp);
+	/* Keep n->pos at the import keyword for structural diagnostics. Go's
+	 * import declaration position is the first spec token: the explicit alias
+	 * when present, otherwise the path. */
+	n->usefile = p->cur.pos.file;
+	n->useline = p->cur.pos.line;
+	n->usecol = p->cur.pos.col;
 	const char *alias = NULL;
 	const char *first;
 	if (p->cur.kind == TK_UNDER) {