Auto merge of #49823 - Zoxc:term-str, r=alexcrichton

Remove usages of Term::as_str and mark it for removal

Returning references to rustc internal data structures is a bad idea since their lifetimes are unrelated to the lifetimes of proc_macro values.

See https://github.com/rust-lang/rust/pull/46972 and the `Taming thread-local storage` section of https://internals.rust-lang.org/t/parallelizing-rustc-using-rayon/6606

r? @alexcrichton

1 files changed, 3 insertions, 2 deletions

diff --git a/src/libproc_macro/lib.rs b/src/libproc_macro/lib.rs
index 8451e5987e9..c55df9b39b8 100644
--- a/src/libproc_macro/lib.rs
+++ b/src/libproc_macro/lib.rs
@@ -755,6 +755,7 @@ impl Term {
         }
     }
 
+    // FIXME: Remove this, do not stabilize
     /// Get a reference to the interned string.
     #[unstable(feature = "proc_macro", issue = "38356")]
     pub fn as_str(&self) -> &str {
@@ -779,7 +780,7 @@ impl Term {
 #[unstable(feature = "proc_macro", issue = "38356")]
 impl fmt::Display for Term {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        self.as_str().fmt(f)
+        self.sym.as_str().fmt(f)
     }
 }
 
@@ -1176,7 +1177,7 @@ impl TokenTree {
             },
             self::TokenTree::Term(tt) => {
                 let ident = ast::Ident::new(tt.sym, tt.span.0);
-                let sym_str = tt.sym.as_str();
+                let sym_str = tt.sym.to_string();
                 let token = if sym_str.starts_with("'") {
                     Lifetime(ident)
                 } else if sym_str.starts_with("r#") {