expand: add recovery for parse_nt

src/test/ui/parser/issue-62894.stderr

@@ -42,6 +42,11 @@ LL | fn f() { assert_eq!(f(), (), assert_eq!(assert_eq!
 LL | 
 LL | fn main() {}
    | ^^ unexpected token
+   | 
+  ::: $SRC_DIR/libcore/macros/mod.rs:LL:COL
+   |
+LL |     ($left:expr, $right:expr) => ({
+   |      ---------- while parsing argument for this `expr` macro fragment
 
 error: aborting due to 4 previous errors
 

src/test/ui/parser/nt-parsing-has-recovery.rs

@@ -0,0 +1,10 @@
+macro_rules! foo {
+    ($e:expr) => {}
+}
+
+foo!(1 + @); //~ ERROR expected expression, found `@`
+foo!(1 + @); //~ ERROR expected expression, found `@`
+
+fn main() {
+    let _recovery_witness: () = 0; //~ ERROR mismatched types
+}

src/test/ui/parser/nt-parsing-has-recovery.stderr

@@ -0,0 +1,29 @@
+error: expected expression, found `@`
+  --> $DIR/nt-parsing-has-recovery.rs:5:10
+   |
+LL |     ($e:expr) => {}
+   |      ------- while parsing argument for this `expr` macro fragment
+...
+LL | foo!(1 + @);
+   |          ^ expected expression
+
+error: expected expression, found `@`
+  --> $DIR/nt-parsing-has-recovery.rs:6:10
+   |
+LL |     ($e:expr) => {}
+   |      ------- while parsing argument for this `expr` macro fragment
+...
+LL | foo!(1 + @);
+   |          ^ expected expression
+
+error[E0308]: mismatched types
+  --> $DIR/nt-parsing-has-recovery.rs:9:33
+   |
+LL |     let _recovery_witness: () = 0;
+   |                            --   ^ expected `()`, found integer
+   |                            |
+   |                            expected due to this
+
+error: aborting due to 3 previous errors
+
+For more information about this error, try `rustc --explain E0308`.