Capture tokens for Pat used in macro_rules! argument

This extends PR #73293 to handle patterns (Pat). Unlike expressions,
patterns do not support custom attributes, so we only need to capture
tokens during macro_rules! argument parsing.

src/test/ui/proc-macro/capture-macro-rules-invoke.rs

@@ -1,12 +1,20 @@
 // aux-build:test-macros.rs
 // check-pass
+// compile-flags: -Z span-debug
+// normalize-stdout-test "#\d+" -> "#CTXT"
 
 extern crate test_macros;
-use test_macros::recollect;
+use test_macros::print_bang;
 
 macro_rules! use_expr {
     ($expr:expr) => {
-        recollect!($expr)
+        print_bang!($expr)
+    }
+}
+
+macro_rules! use_pat {
+    ($pat:pat) => {
+        print_bang!($pat)
     }
 }
 
@@ -17,6 +25,10 @@ impl Foo {
     fn use_self(self) {
         drop(use_expr!(self));
     }
+
+    fn with_pat(use_pat!((a, b)): (u32, u32)) {
+        println!("Args: {} {}", a, b);
+    }
 }
 
 fn main() {}