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Update instructions in a comment.

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And avoid duplication.
This commit is contained in:
Nicholas Nethercote 2023-11-09 09:30:22 +11:00
parent b35e576657
commit 316ffba3c8
1 changed files with 3 additions and 10 deletions
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13
compiler/rustc_macros/src/symbols.rs
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@ -19,7 +19,9 @@
//! ```bash //! ```bash
//! cargo install cargo-expand # this is necessary only once //! cargo install cargo-expand # this is necessary only once
//! cd compiler/rustc_span //! cd compiler/rustc_span
//! cargo expand > /tmp/rustc_span.rs # it's a big file //! # The specific version number in CFG_RELEASE doesn't matter.
//! # The output is large.
//! CFG_RELEASE="0.0.0" cargo +nightly expand > /tmp/rustc_span.rs
//! ``` //! ```
use proc_macro2::{Span, TokenStream}; use proc_macro2::{Span, TokenStream};
@ -318,13 +320,4 @@ fn symbols_with_errors(input: TokenStream) -> (TokenStream, Vec<syn::Error>) {
}; };
(output, errors.list) (output, errors.list)
// To see the generated code, use the "cargo expand" command.
// Do this once to install:
// cargo install cargo-expand
//
// Then, cd to rustc_span and run:
// cargo expand > /tmp/rustc_span_expanded.rs
//
// and read that file.
} }