Add test coverage for proc-macro invalid tup index suffixes

1 files changed, 31 insertions, 0 deletions

diff --git a/tests/ui/parser/tuple-index-suffix-proc-macro.rs b/tests/ui/parser/tuple-index-suffix-proc-macro.rs
new file mode 100644
index 00000000000..feca6f9cdfb
--- /dev/null
+++ b/tests/ui/parser/tuple-index-suffix-proc-macro.rs
@@ -0,0 +1,31 @@
+//! See #59418.
+//!
+//! Like `tuple-index-suffix.rs`, but exercises the proc-macro interaction.
+
+//@ proc-macro: tuple-index-suffix-proc-macro-aux.rs
+
+extern crate tuple_index_suffix_proc_macro_aux;
+use tuple_index_suffix_proc_macro_aux as aux;
+
+fn main() {
+    struct TupStruct(i32);
+    let tup_struct = TupStruct(42);
+
+    // #60186 carve outs `{i,u}{32,usize}` as non-lint pseudo-FCW warnings.
+
+    aux::bad_tup_indexing!(0usize);
+    //~^ WARN suffixes on a tuple index are invalid
+    aux::bad_tup_struct_indexing!(tup_struct, 0isize);
+    //~^ WARN suffixes on a tuple index are invalid
+
+    // Not part of the #60186 carve outs.
+
+    aux::bad_tup_indexing!(0u8);
+    //~^ ERROR suffixes on a tuple index are invalid
+    aux::bad_tup_struct_indexing!(tup_struct, 0u64);
+    //~^ ERROR suffixes on a tuple index are invalid
+
+    // NOTE: didn't bother with trying to figure out how to generate `struct P { 0u32: u32 }` using
+    // *only* `proc_macro` without help with `syn`/`quote`, looks like you can't with just
+    // `proc_macro::quote`?
+}