Merging upstream version 1.68.2+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/tests/ui/macros/nonterminal-matching.rs b/tests/ui/macros/nonterminal-matching.rs
new file mode 100644
index 000000000..84fffe44d
--- /dev/null
+++ b/tests/ui/macros/nonterminal-matching.rs
@@ -0,0 +1,26 @@
+// Check that we are refusing to match on complex nonterminals for which tokens are
+// unavailable and we'd have to go through AST comparisons.
+
+#![feature(decl_macro)]
+
+macro simple_nonterminal($nt_ident: ident, $nt_lifetime: lifetime, $nt_tt: tt) {
+    macro n(a $nt_ident b $nt_lifetime c $nt_tt d) {
+        struct S;
+    }
+
+    n!(a $nt_ident b $nt_lifetime c $nt_tt d);
+}
+
+macro complex_nonterminal($nt_item: item) {
+    macro n(a $nt_item b) {
+        struct S;
+    }
+
+    n!(a $nt_item b); //~ ERROR no rules expected the token `enum E {}`
+}
+
+simple_nonterminal!(a, 'a, (x, y, z)); // OK
+
+complex_nonterminal!(enum E {});
+
+fn main() {}