Fix span handling for EOF tokens to enable proper diagnostics

compiler/rustc_parse/src/parser/mod.rs

@@ -1128,7 +1128,7 @@ impl<'a> Parser<'a> {
         self.break_last_token = 0;
         if next.0.span.is_dummy() {
             // Tweak the location for better diagnostics, but keep syntactic context intact.
-            let fallback_span = self.token.span;
+            let fallback_span = self.token.span.shrink_to_hi();
             next.0.span = fallback_span.with_ctxt(next.0.span.ctxt());
         }
         debug_assert!(!matches!(

tests/ui/parser/lifetime-in-pattern-closure.rs

@@ -0,0 +1,9 @@
+// Test case for issue #134061
+// Check that the compiler properly suggests removing unexpected lifetime in closure pattern
+
+const x: () = |&'a| ();
+//~^ ERROR unexpected lifetime `'a` in pattern
+//~| HELP remove the lifetime
+//~| ERROR expected parameter name, found `|`
+
+fn main() {}

tests/ui/parser/lifetime-in-pattern-closure.stderr

@@ -0,0 +1,20 @@
+error: unexpected lifetime `'a` in pattern
+  --> $DIR/lifetime-in-pattern-closure.rs:4:17
+   |
+LL | const x: () = |&'a| ();
+   |                 ^^
+   |
+help: remove the lifetime
+   |
+LL - const x: () = |&'a| ();
+LL + const x: () = |&| ();
+   |
+
+error: expected parameter name, found `|`
+  --> $DIR/lifetime-in-pattern-closure.rs:4:19
+   |
+LL | const x: () = |&'a| ();
+   |                   ^ expected parameter name
+
+error: aborting due to 2 previous errors
+

tests/ui/parser/lifetime-in-pattern-eof.rs

@@ -0,0 +1,7 @@
+// Test case for issue #134061 - exact reproduction case
+// Tests the specific case where EOF is encountered after lifetime in pattern
+
+const x: () = |&'a
+//~^ ERROR unexpected lifetime `'a` in pattern
+//~| HELP remove the lifetime
+//~| ERROR expected parameter name, found `<eof>`

tests/ui/parser/lifetime-in-pattern-eof.stderr

@@ -0,0 +1,20 @@
+error: unexpected lifetime `'a` in pattern
+  --> $DIR/lifetime-in-pattern-eof.rs:4:17
+   |
+LL | const x: () = |&'a
+   |                 ^^
+   |
+help: remove the lifetime
+   |
+LL - const x: () = |&'a
+LL + const x: () = |&
+   |
+
+error: expected parameter name, found `<eof>`
+  --> $DIR/lifetime-in-pattern-eof.rs:4:19
+   |
+LL | const x: () = |&'a
+   |                   ^ expected parameter name
+
+error: aborting due to 2 previous errors
+