parser: Collect tokens for values in key-value attributes

compiler/rustc_parse/src/parser/mod.rs

@@ -980,12 +980,8 @@ impl<'a> Parser<'a> {
                         }
                     }
 
-                    // The value here is never passed to macros as tokens by itself (not as a part
-                    // of the whole attribute), so we don't collect tokens here. If this changes,
-                    // then token will need to be collected. One catch here is that we are using
-                    // a nonterminal for keeping the expression, but this nonterminal should not
-                    // be wrapped into a group when converting to token stream.
-                    let expr = self.parse_expr()?;
+                    // Collect tokens because they are used during lowering to HIR.
+                    let expr = self.collect_tokens(|this| this.parse_expr())?;
                     let span = expr.span;
 
                     match &expr.kind {

src/test/ui/ast-json/ast-json-noexpand-output.stdout

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src/test/ui/ast-json/ast-json-output.stdout

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src/test/ui/attributes/key-value-non-ascii.rs

@@ -0,0 +1,4 @@
+#![feature(rustc_attrs)]
+
+#[rustc_dummy = b"ffi.rs"] //~ ERROR byte constant must be ASCII
+fn main() {}

src/test/ui/attributes/key-value-non-ascii.stderr

@@ -0,0 +1,8 @@
+error: byte constant must be ASCII. Use a \xHH escape for a non-ASCII byte
+  --> $DIR/key-value-non-ascii.rs:3:19
+   |
+LL | #[rustc_dummy = b"ffi.rs"]
+   |                   ^
+
+error: aborting due to previous error
+