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bors e91405b9d5 Auto merge of #87262 - dtolnay:negative, r=Aaron1011 
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.
2021-08-03 04:50:28 +00:00
..
rustc rfc3052: Remove authors field from Cargo manifests 2021-07-29 14:56:05 -07:00
rustc_apfloat rfc3052: Remove authors field from Cargo manifests 2021-07-29 14:56:05 -07:00
rustc_arena rfc3052: Remove authors field from Cargo manifests 2021-07-29 14:56:05 -07:00
rustc_ast Auto merge of #87535 - lf-:authors, r=Mark-Simulacrum 2021-08-02 05:49:17 +00:00
rustc_ast_lowering Rollup merge of #87687 - camsteffen:inline-macros, r=oli-obk 2021-08-02 09:36:54 -05:00
rustc_ast_passes rfc3052: Remove authors field from Cargo manifests 2021-07-29 14:56:05 -07:00
rustc_ast_pretty Auto merge of #87535 - lf-:authors, r=Mark-Simulacrum 2021-08-02 05:49:17 +00:00
rustc_attr rfc3052: Remove authors field from Cargo manifests 2021-07-29 14:56:05 -07:00
rustc_builtin_macros rfc3052: Remove authors field from Cargo manifests 2021-07-29 14:56:05 -07:00
rustc_codegen_cranelift rfc3052: Remove authors field from Cargo manifests 2021-07-29 14:56:05 -07:00
rustc_codegen_llvm Auto merge of #87535 - lf-:authors, r=Mark-Simulacrum 2021-08-02 05:49:17 +00:00
rustc_codegen_ssa rfc3052: Remove authors field from Cargo manifests 2021-07-29 14:56:05 -07:00
rustc_data_structures rfc3052: Remove authors field from Cargo manifests 2021-07-29 14:56:05 -07:00
rustc_driver Auto merge of #87535 - lf-:authors, r=Mark-Simulacrum 2021-08-02 05:49:17 +00:00
rustc_error_codes Auto merge of #87535 - lf-:authors, r=Mark-Simulacrum 2021-08-02 05:49:17 +00:00
rustc_errors Auto merge of #87535 - lf-:authors, r=Mark-Simulacrum 2021-08-02 05:49:17 +00:00
rustc_expand Auto merge of #87262 - dtolnay:negative, r=Aaron1011 2021-08-03 04:50:28 +00:00
rustc_feature Rollup merge of #86176 - nbdd0121:explicit-generic-args, r=jackh726 2021-08-02 09:36:49 -05:00
rustc_fs_util rfc3052: Remove authors field from Cargo manifests 2021-07-29 14:56:05 -07:00
rustc_graphviz rfc3052: Remove authors field from Cargo manifests 2021-07-29 14:56:05 -07:00
rustc_hir Auto merge of #87535 - lf-:authors, r=Mark-Simulacrum 2021-08-02 05:49:17 +00:00
rustc_hir_pretty Auto merge of #87535 - lf-:authors, r=Mark-Simulacrum 2021-08-02 05:49:17 +00:00
rustc_incremental rfc3052: Remove authors field from Cargo manifests 2021-07-29 14:56:05 -07:00
rustc_index rfc3052: Remove authors field from Cargo manifests 2021-07-29 14:56:05 -07:00
rustc_infer Auto merge of #87628 - estebank:unmet-explicit-lifetime-bound, r=oli-obk 2021-08-02 23:16:40 +00:00
rustc_interface rfc3052: Remove authors field from Cargo manifests 2021-07-29 14:56:05 -07:00
rustc_lexer Auto merge of #87535 - lf-:authors, r=Mark-Simulacrum 2021-08-02 05:49:17 +00:00
rustc_lint Auto merge of #87535 - lf-:authors, r=Mark-Simulacrum 2021-08-02 05:49:17 +00:00
rustc_lint_defs Auto merge of #87535 - lf-:authors, r=Mark-Simulacrum 2021-08-02 05:49:17 +00:00
rustc_llvm Auto merge of #87535 - lf-:authors, r=Mark-Simulacrum 2021-08-02 05:49:17 +00:00
rustc_macros Auto merge of #87535 - lf-:authors, r=Mark-Simulacrum 2021-08-02 05:49:17 +00:00
rustc_metadata rfc3052: Remove authors field from Cargo manifests 2021-07-29 14:56:05 -07:00
rustc_middle Auto merge of #87248 - RalfJung:ctfe-partial-overwrite, r=oli-obk 2021-08-02 13:31:02 +00:00
rustc_mir Auto merge of #87628 - estebank:unmet-explicit-lifetime-bound, r=oli-obk 2021-08-02 23:16:40 +00:00
rustc_mir_build rfc3052: Remove authors field from Cargo manifests 2021-07-29 14:56:05 -07:00
rustc_parse Rollup merge of #87659 - FabianWolff:issue-87397, r=davidtwco 2021-08-02 09:36:51 -05:00
rustc_parse_format rfc3052: Remove authors field from Cargo manifests 2021-07-29 14:56:05 -07:00
rustc_passes Auto merge of #87535 - lf-:authors, r=Mark-Simulacrum 2021-08-02 05:49:17 +00:00
rustc_plugin_impl rfc3052: Remove authors field from Cargo manifests 2021-07-29 14:56:05 -07:00
rustc_privacy rfc3052: Remove authors field from Cargo manifests 2021-07-29 14:56:05 -07:00
rustc_query_impl rfc3052: Remove authors field from Cargo manifests 2021-07-29 14:56:05 -07:00
rustc_query_system Auto merge of #87535 - lf-:authors, r=Mark-Simulacrum 2021-08-02 05:49:17 +00:00
rustc_resolve Auto merge of #87535 - lf-:authors, r=Mark-Simulacrum 2021-08-02 05:49:17 +00:00
rustc_save_analysis Auto merge of #87535 - lf-:authors, r=Mark-Simulacrum 2021-08-02 05:49:17 +00:00
rustc_serialize rfc3052: Remove authors field from Cargo manifests 2021-07-29 14:56:05 -07:00
rustc_session Auto merge of #87535 - lf-:authors, r=Mark-Simulacrum 2021-08-02 05:49:17 +00:00
rustc_span Auto merge of #87262 - dtolnay:negative, r=Aaron1011 2021-08-03 04:50:28 +00:00
rustc_symbol_mangling Auto merge of #87535 - lf-:authors, r=Mark-Simulacrum 2021-08-02 05:49:17 +00:00
rustc_target Auto merge of #87535 - lf-:authors, r=Mark-Simulacrum 2021-08-02 05:49:17 +00:00
rustc_trait_selection Auto merge of #87535 - lf-:authors, r=Mark-Simulacrum 2021-08-02 05:49:17 +00:00
rustc_traits Auto merge of #87535 - lf-:authors, r=Mark-Simulacrum 2021-08-02 05:49:17 +00:00
rustc_ty_utils rfc3052: Remove authors field from Cargo manifests 2021-07-29 14:56:05 -07:00
rustc_type_ir rfc3052: Remove authors field from Cargo manifests 2021-07-29 14:56:05 -07:00
rustc_typeck Rollup merge of #87687 - camsteffen:inline-macros, r=oli-obk 2021-08-02 09:36:54 -05:00