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Should ast::Position use Symbol instead of str? #60795

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oli-obk opened this issue May 13, 2019 · 4 comments · Fixed by #61568
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Should ast::Position use Symbol instead of str? #60795

oli-obk opened this issue May 13, 2019 · 4 comments · Fixed by #61568
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@Mark-Simulacrum
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A-parser Area: The parsing of Rust source code to an AST C-cleanup Category: PRs that clean code up or issues documenting cleanup.

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@oli-obk
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oli-obk commented May 13, 2019

rust/src/libfmt_macros/lib.rs

Line 74 in 258e3b3

ArgumentNamed(&'a str),
is compared against symbols in clippy, and I believe in rustc many uses could also be comparing against symbols. Is this something we should do @nnethercote ?
@oli-obk oli-obk added C-cleanup Category: PRs that clean code up or issues documenting cleanup. A-parser Area: The parsing of Rust source code to an AST labels May 13, 2019
@nnethercote
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Possibly. The best way to decide is to simply try it and see how well it works. Sometimes switching to a symbol makes everything fall out nicely. Sometimes there are a bunch of follow-on changes required but it still ends up nice. Sometimes it ends up making the code more complicated and a string is better.

@nnethercote
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Hmm, libfmt_macros currently doesn't depend on any crates, and with this change it would depend on libsyntax_pos.

@oli-obk
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oli-obk commented May 14, 2019

libfmt_macros also custom rolls its own Span type. Having a dependency on libsyntax_pos can possibly make a lot of things simpler, but I haven't checked in depth.

cc @estebank

@estebank
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I believe that should likely be appropriate. CC me on the PRs to take a look at them.

@Mark-Simulacrum Mark-Simulacrum self-assigned this Jun 4, 2019
@Mark-Simulacrum Mark-Simulacrum mentioned this issue Jun 6, 2019
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Centril added a commit to Centril/rust that referenced this issue Jun 12, 2019
@Centril
Rollup merge of rust-lang#61568 - Mark-Simulacrum:symbol-fmt-macros, …
d78260d 
…r=estebank

Use Symbol, Span in libfmt_macros

I'm not super happy with this, personally, but I think it might be a decent start -- happy to take suggestions as to how to expand this or change things further.

r? @estebank

Fixes rust-lang#60795
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A-parser Area: The parsing of Rust source code to an AST C-cleanup Category: PRs that clean code up or issues documenting cleanup.
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Use Symbol, Span in libfmt_macros Mark-Simulacrum/rust
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@oli-obk @estebank @nnethercote @Mark-Simulacrum