Rollup merge of #66935 - petrochenkov:attrtok2, r=Centril

syntax: Unify macro and attribute arguments in AST

The unified form (`ast::MacArgs`) represents parsed arguments instead of an unstructured token stream that was previously used for attributes.
It also tracks some spans and delimiter kinds better for fn-like macros and macro definitions.

I've been talking about implementing this with @nnethercote in https://github.com/rust-lang/rust/pull/65750#issuecomment-546517322.
The parsed representation is closer to `MetaItem` and requires less token juggling during conversions, so it potentially may be faster.

r? @Centril

1 files changed, 2 insertions, 4 deletions

diff --git a/src/librustc_parse/parser/expr.rs b/src/librustc_parse/parser/expr.rs
index 43c740f7f93..1112274dc46 100644
--- a/src/librustc_parse/parser/expr.rs
+++ b/src/librustc_parse/parser/expr.rs
@@ -922,13 +922,11 @@ impl<'a> Parser<'a> {
                     // `!`, as an operator, is prefix, so we know this isn't that.
                     if self.eat(&token::Not) {
                         // MACRO INVOCATION expression
-                        let (delim, tts) = self.expect_delimited_token_tree()?;
+                        let args = self.parse_mac_args()?;
                         hi = self.prev_span;
                         ex = ExprKind::Mac(Mac {
                             path,
-                            tts,
-                            delim,
-                            span: lo.to(hi),
+                            args,
                             prior_type_ascription: self.last_type_ascription,
                         });
                     } else if self.check(&token::OpenDelim(token::Brace)) {