Fix invalid silencing of parsing error

Given

```rust
macro_rules! a {
    ( ) => {
        impl<'b> c for d {
            e::<f'g>
        }
    };
}
```

ensure an error is emitted.

Fix rust-lang#123079.

Author: estebank

compiler/rustc_parse/src/lexer/mod.rs

@@ -138,6 +138,9 @@ impl<'psess, 'src> StringReader<'psess, 'src> {
             if let rustc_lexer::TokenKind::Semi
             | rustc_lexer::TokenKind::LineComment { .. }
             | rustc_lexer::TokenKind::BlockComment { .. }
+            | rustc_lexer::TokenKind::OpenParen
+            | rustc_lexer::TokenKind::OpenBrace
+            | rustc_lexer::TokenKind::OpenBracket
             | rustc_lexer::TokenKind::CloseParen
             | rustc_lexer::TokenKind::CloseBrace
             | rustc_lexer::TokenKind::CloseBracket = token.kind

tests/ui/lexer/dont-ice-on-invalid-lifetime-in-macro-definition.rs

@@ -0,0 +1,9 @@
+//@ edition:2021
+macro_rules! a {
+    ( ) => {
+        impl<'b> c for d {
+            e::<f'g> //~ ERROR prefix `f` is unknown
+        }
+    };
+}
+fn main() {}

tests/ui/lexer/dont-ice-on-invalid-lifetime-in-macro-definition.stderr

@@ -0,0 +1,14 @@
+error: prefix `f` is unknown
+  --> $DIR/dont-ice-on-invalid-lifetime-in-macro-definition.rs:5:17
+   |
+LL |             e::<f'g>
+   |                 ^ unknown prefix
+   |
+   = note: prefixed identifiers and literals are reserved since Rust 2021
+help: consider inserting whitespace here
+   |
+LL |             e::<f 'g>
+   |                  +
+
+error: aborting due to 1 previous error
+

tests/ui/lexer/lex-bad-str-literal-as-char-3.rs

@@ -3,5 +3,5 @@
 //@[rust2021] edition:2021
 fn main() {
     println!('hello world');
-    //[rust2015,rust2018,rust2021]~^ ERROR unterminated character literal
+    //~^ ERROR unterminated character literal
 }

tests/ui/lexer/lex-bad-str-literal-as-char-4.rs

@@ -0,0 +1,8 @@
+//@edition:2021
+macro_rules! foo {
+    () => {
+        println!('hello world');
+        //~^ ERROR unterminated character literal
+    }
+}
+fn main() {}

tests/ui/lexer/lex-bad-str-literal-as-char-4.stderr

@@ -0,0 +1,14 @@
+error[E0762]: unterminated character literal
+  --> $DIR/lex-bad-str-literal-as-char-4.rs:4:30
+   |
+LL |         println!('hello world');
+   |                              ^^^
+   |
+help: if you meant to write a string literal, use double quotes
+   |
+LL |         println!("hello world");
+   |                  ~           ~
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0762`.