Rollup merge of #75084 - Aaron1011:stabilize/ident-new-raw, r=petrochenkov

Stabilize Ident::new_raw

Tracking issue: #54723

This is a continuation of PR #59002

src/test/ui/proc-macro/auxiliary/raw-ident.rs

@@ -0,0 +1,35 @@
+// force-host
+// no-prefer-dynamic
+
+#![crate_type = "proc-macro"]
+
+extern crate proc_macro;
+use proc_macro::{TokenStream, TokenTree, Ident, Punct, Spacing, Span};
+
+#[proc_macro]
+pub fn make_struct(input: TokenStream) -> TokenStream {
+    match input.into_iter().next().unwrap() {
+        TokenTree::Ident(ident) => {
+            vec![
+                TokenTree::Ident(Ident::new("struct", Span::call_site())),
+                TokenTree::Ident(Ident::new_raw(&ident.to_string(), Span::call_site())),
+                TokenTree::Punct(Punct::new(';', Spacing::Alone))
+            ].into_iter().collect()
+        }
+        _ => panic!()
+    }
+}
+
+#[proc_macro]
+pub fn make_bad_struct(input: TokenStream) -> TokenStream {
+    match input.into_iter().next().unwrap() {
+        TokenTree::Ident(ident) => {
+            vec![
+                TokenTree::Ident(Ident::new_raw("struct", Span::call_site())),
+                TokenTree::Ident(Ident::new(&ident.to_string(), Span::call_site())),
+                TokenTree::Punct(Punct::new(';', Spacing::Alone))
+            ].into_iter().collect()
+        }
+        _ => panic!()
+    }
+}

src/test/ui/proc-macro/raw-ident.rs

@@ -0,0 +1,16 @@
+// aux-build:raw-ident.rs
+
+#[macro_use] extern crate raw_ident;
+
+fn main() {
+    make_struct!(fn);
+    make_struct!(Foo);
+    make_struct!(await);
+
+    r#fn;
+    r#Foo;
+    Foo;
+    r#await;
+
+    make_bad_struct!(S); //~ ERROR expected one of
+}

src/test/ui/proc-macro/raw-ident.stderr

@@ -0,0 +1,10 @@
+error: expected one of `!`, `.`, `::`, `;`, `?`, `{`, `}`, or an operator, found `S`
+  --> $DIR/raw-ident.rs:15:5
+   |
+LL |     make_bad_struct!(S);
+   |     ^^^^^^^^^^^^^^^^^^^^ expected one of 8 possible tokens
+   |
+   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: aborting due to previous error
+