Split `MacArgs` in two.

`MacArgs` is an enum with three variants: `Empty`, `Delimited`, and `Eq`. It's
used in two ways:
- For representing attribute macro arguments (e.g. in `AttrItem`), where all
  three variants are used.
- For representing function-like macros (e.g. in `MacCall` and `MacroDef`),
  where only the `Delimited` variant is used.

In other words, `MacArgs` is used in two quite different places due to them
having partial overlap. I find this makes the code hard to read. It also leads
to various unreachable code paths, and allows invalid values (such as
accidentally using `MacArgs::Empty` in a `MacCall`).

This commit splits `MacArgs` in two:
- `DelimArgs` is a new struct just for the "delimited arguments" case. It is
  now used in `MacCall` and `MacroDef`.
- `AttrArgs` is a renaming of the old `MacArgs` enum for the attribute macro
  case. Its `Delimited` variant now contains a `DelimArgs`.

Various other related things are renamed as well.

These changes make the code clearer, avoids several unreachable paths, and
disallows the invalid values.

1 files changed, 1 insertions, 1 deletions

diff --git a/clippy_lints/src/crate_in_macro_def.rs b/clippy_lints/src/crate_in_macro_def.rs
index 20cc330e035..b2fe0386f94 100644
--- a/clippy_lints/src/crate_in_macro_def.rs
+++ b/clippy_lints/src/crate_in_macro_def.rs
@@ -55,7 +55,7 @@ impl EarlyLintPass for CrateInMacroDef {
         if_chain! {
             if item.attrs.iter().any(is_macro_export);
             if let ItemKind::MacroDef(macro_def) = &item.kind;
-            let tts = macro_def.body.inner_tokens();
+            let tts = macro_def.body.tokens.clone();
             if let Some(span) = contains_unhygienic_crate_reference(&tts);
             then {
                 span_lint_and_sugg(