diff options
Diffstat (limited to 'compiler/rustc_builtin_macros/src/cfg_eval.rs')
| -rw-r--r-- | compiler/rustc_builtin_macros/src/cfg_eval.rs | 10 |
1 files changed, 3 insertions, 7 deletions
diff --git a/compiler/rustc_builtin_macros/src/cfg_eval.rs b/compiler/rustc_builtin_macros/src/cfg_eval.rs index b3ba9073118..da01e3e9607 100644 --- a/compiler/rustc_builtin_macros/src/cfg_eval.rs +++ b/compiler/rustc_builtin_macros/src/cfg_eval.rs @@ -92,11 +92,7 @@ impl CfgEval<'_> { // the location of `#[cfg]` and `#[cfg_attr]` in the token stream. The tokenization // process is lossless, so this process is invisible to proc-macros. - // 'Flatten' all nonterminals (i.e. `TokenKind::Interpolated`) - // to `None`-delimited groups containing the corresponding tokens. This - // is normally delayed until the proc-macro server actually needs to - // provide a `TokenKind::Interpolated` to a proc-macro. We do this earlier, - // so that we can handle cases like: + // Interesting cases: // // ```rust // #[cfg_eval] #[cfg] $item @@ -104,8 +100,8 @@ impl CfgEval<'_> { // // where `$item` is `#[cfg_attr] struct Foo {}`. We want to make // sure to evaluate *all* `#[cfg]` and `#[cfg_attr]` attributes - the simplest - // way to do this is to do a single parse of a stream without any nonterminals. - let orig_tokens = annotatable.to_tokens().flattened(); + // way to do this is to do a single parse of the token stream. + let orig_tokens = annotatable.to_tokens(); // Re-parse the tokens, setting the `capture_cfg` flag to save extra information // to the captured `AttrTokenStream` (specifically, we capture |