e91405b9d5
Support negative numbers in Literal::from_str proc_macro::Literal has allowed negative numbers in a single literal token ever since Rust 1.29, using https://doc.rust-lang.org/stable/proc_macro/struct.Literal.html#method.isize_unsuffixed and similar constructors. ```rust let lit = proc_macro::Literal::isize_unsuffixed(-10); ``` However, the suite of constructors on Literal is not sufficient for all use cases, for example arbitrary precision floats, or custom suffixes in FFI macros. ```rust let lit = proc_macro::Literal::f64_unsuffixed(0.101001000100001000001000000100000001); // :( let lit = proc_macro::Literal::i???_suffixed(10ulong); // :( ``` For those, macros construct the literal using from_str instead, which preserves arbitrary precision, custom suffixes, base, and digit grouping. ```rust let lit = "0.101001000100001000001000000100000001".parse::<Literal>().unwrap(); let lit = "10ulong".parse::<Literal>().unwrap(); let lit = "0b1000_0100_0010_0001".parse::<Literal>().unwrap(); ``` However, until this PR it was not possible to construct a literal token that is **both** negative **and** preserving of arbitrary precision etc. This PR fixes `Literal::from_str` to recognize negative integer and float literals. |
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| .. | ||
| analyze_source_file | ||
| lev_distance | ||
| source_map | ||
| symbol | ||
| analyze_source_file.rs | ||
| caching_source_map_view.rs | ||
| def_id.rs | ||
| edition.rs | ||
| fatal_error.rs | ||
| hygiene.rs | ||
| lev_distance.rs | ||
| lib.rs | ||
| source_map.rs | ||
| span_encoding.rs | ||
| symbol.rs | ||
| tests.rs | ||