73b50d211b
This works just as you might expect - an 'extern const fn' is a 'const fn' that is callable from foreign code. Currently, panicking is not allowed in consts. When RFC 2345 is stabilized, then panicking in an 'extern const fn' will produce a compile-time error when invoked at compile time, and an abort when invoked at runtime. Since this is extending the language (we're allowing the `const` keyword in a new context), I believe that this will need an FCP. However, it's a very minor change, so I didn't think that filing an RFC was necessary. This will allow libc (and other FFI crates) to make many functions `const`, without having to give up on making them `extern` as well. |
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|---|---|---|
| .. | ||
| ast | ||
| attr | ||
| diagnostics | ||
| ext | ||
| feature_gate | ||
| mut_visit | ||
| parse | ||
| source_map | ||
| tokenstream | ||
| util | ||
| ast.rs | ||
| build.rs | ||
| Cargo.toml | ||
| config.rs | ||
| early_buffered_lints.rs | ||
| entry.rs | ||
| error_codes.rs | ||
| json.rs | ||
| lib.rs | ||
| mut_visit.rs | ||
| ptr.rs | ||
| README.md | ||
| show_span.rs | ||
| source_map.rs | ||
| tests.rs | ||
| tokenstream.rs | ||
| visit.rs | ||
The syntax crate contains those things concerned purely with syntax
– that is, the AST ("abstract syntax tree"), parser, pretty-printer,
lexer, macro expander, and utilities for traversing ASTs.
For more information about how these things work in rustc, see the rustc guide: