try gating early, add non-ascii test

compiler/rustc_ast_passes/src/feature_gate.rs

@@ -1,4 +1,3 @@
-use ast::token;
 use rustc_ast as ast;
 use rustc_ast::visit::{self, AssocCtxt, FnCtxt, FnKind, Visitor};
 use rustc_ast::{attr, AssocConstraint, AssocConstraintKind, NodeId};

compiler/rustc_parse/src/parser/expr.rs

@@ -1922,6 +1922,7 @@ impl<'a> Parser<'a> {
         let recovered = self.recover_after_dot();
         let token = recovered.as_ref().unwrap_or(&self.token);
         let span = token.span;
+
         token::Lit::from_token(token).map(|token_lit| {
             self.bump();
             (token_lit, span)