Jonas Schievink f66af28641 Rollup merge of #79016 - fanzier:underscore-expressions, r=petrochenkov ... Make `_` an expression, to discard values in destructuring assignments This is the third and final step towards implementing destructuring assignment (RFC: rust-lang/rfcs#2909, tracking issue: #71126). This PR is the third and final part of #71156, which was split up to allow for easier review. With this PR, an underscore `_` is parsed as an expression but is allowed *only* on the left-hand side of a destructuring assignment. There it simply discards a value, similarly to the wildcard `_` in patterns. For instance, ```rust (a, _) = (1, 2) ``` will simply assign 1 to `a` and discard the 2. Note that for consistency, ``` _ = foo ``` is also allowed and equivalent to just `foo`. Thanks to ````@varkor```` who helped with the implementation, particularly around pre-expansion gating. r? ````@petrochenkov````		2020-11-15 13:39:48 +01:00
..
rustc
rustc_apfloat
rustc_arena	Fix even more clippy warnings	2020-10-30 10:13:39 -04:00
rustc_ast	Rollup merge of #79016 - fanzier:underscore-expressions, r=petrochenkov	2020-11-15 13:39:48 +01:00
rustc_ast_lowering	Rollup merge of #79016 - fanzier:underscore-expressions, r=petrochenkov	2020-11-15 13:39:48 +01:00
rustc_ast_passes	Add underscore expressions for destructuring assignments	2020-11-14 13:53:12 +00:00
rustc_ast_pretty	Rollup merge of #79016 - fanzier:underscore-expressions, r=petrochenkov	2020-11-15 13:39:48 +01:00
rustc_attr	Improve deprecation attribute diagnostic messages.	2020-11-02 13:21:18 +01:00
rustc_builtin_macros	Rollup merge of #79005 - petrochenkov:noinjected, r=davidtwco	2020-11-15 13:39:46 +01:00
rustc_codegen_cranelift	Changed unwrap_or to unwrap_or_else in some places.	2020-11-10 20:07:47 -08:00
rustc_codegen_llvm	Rollup merge of #77802 - jyn514:bootstrap-specific, r=nikomatsakis	2020-11-15 13:39:43 +01:00
rustc_codegen_ssa	rustc_target: Mark UEFI targets as is_like_windows/is_like_msvc	2020-11-12 19:40:41 +03:00
rustc_data_structures	Move post order walk to iterative approach	2020-10-31 18:52:00 +01:00
rustc_driver	Rollup merge of #79005 - petrochenkov:noinjected, r=davidtwco	2020-11-15 13:39:46 +01:00
rustc_error_codes	deny(invalid_codeblock_attributes)	2020-11-05 12:13:28 -05:00
rustc_errors	Auto merge of #76931 - oli-obk:const_prop_inline_lint_madness, r=wesleywiser	2020-11-03 16:32:34 +00:00
rustc_expand	Rollup merge of #78836 - fanzier:struct-and-slice-destructuring, r=petrochenkov	2020-11-12 19:46:09 +01:00
rustc_feature	Rollup merge of #77802 - jyn514:bootstrap-specific, r=nikomatsakis	2020-11-15 13:39:43 +01:00
rustc_fs_util
rustc_graphviz	Rust coverage before splitting instrument_coverage.rs	2020-11-05 18:24:12 -08:00
rustc_hir	Rollup merge of #78836 - fanzier:struct-and-slice-destructuring, r=petrochenkov	2020-11-12 19:46:09 +01:00
rustc_hir_pretty	Fix even more clippy warnings	2020-10-30 10:13:39 -04:00
rustc_incremental	Allow making RUSTC_BOOTSTRAP conditional on the crate name	2020-11-07 13:45:11 -05:00
rustc_index
rustc_infer	Rollup merge of #78463 - varkor:placeholder-const, r=nikomatsakis	2020-11-13 15:26:14 +01:00
rustc_interface	cleanup: Remove ParseSess::injected_crate_name	2020-11-13 00:59:57 +03:00
rustc_lexer	Add back missing comments	2020-10-30 10:13:41 -04:00
rustc_lint	Reserve space in advance	2020-11-13 11:19:25 +01:00
rustc_lint_defs	Rollup merge of #78114 - jyn514:private, r=oli-obk	2020-11-09 01:13:31 +01:00
rustc_llvm	fully exploited the dropped support of LLVM 8	2020-11-12 14:39:47 +01:00
rustc_macros	Small cleanup in TypeFoldable derive macro	2020-11-07 18:20:42 +01:00
rustc_metadata	Push to result vector instead of allocating	2020-11-13 11:19:25 +01:00
rustc_middle	Rollup merge of #78963 - richkadel:llvm-coverage-counters-2.0.4, r=tmandry	2020-11-15 03:02:46 +01:00
rustc_mir	Rollup merge of #77802 - jyn514:bootstrap-specific, r=nikomatsakis	2020-11-15 13:39:43 +01:00
rustc_mir_build	Rollup merge of #77802 - jyn514:bootstrap-specific, r=nikomatsakis	2020-11-15 13:39:43 +01:00
rustc_parse	Rollup merge of #79016 - fanzier:underscore-expressions, r=petrochenkov	2020-11-15 13:39:48 +01:00
rustc_parse_format
rustc_passes	Rollup merge of #77802 - jyn514:bootstrap-specific, r=nikomatsakis	2020-11-15 13:39:43 +01:00
rustc_plugin_impl
rustc_privacy	Fix even more URLs	2020-11-05 20:11:29 +01:00
rustc_query_system	Fix even more clippy warnings	2020-10-30 10:13:39 -04:00
rustc_resolve	Rollup merge of #77802 - jyn514:bootstrap-specific, r=nikomatsakis	2020-11-15 13:39:43 +01:00
rustc_save_analysis	Rollup merge of #78352 - JohnTitor:issue-75229, r=Dylan-DPC	2020-11-15 03:02:34 +01:00
rustc_serialize
rustc_session	Rollup merge of #79005 - petrochenkov:noinjected, r=davidtwco	2020-11-15 13:39:46 +01:00
rustc_span	Auto merge of #76256 - tgnottingham:issue-74890, r=nikomatsakis	2020-11-12 15:34:09 +00:00
rustc_symbol_mangling	u128 truncation and sign extension are not just interpreter related	2020-11-04 13:41:58 +00:00
rustc_target	Rollup merge of #78993 - petrochenkov:specdash, r=oli-obk	2020-11-15 03:02:59 +01:00
rustc_trait_selection	Rollup merge of #77802 - jyn514:bootstrap-specific, r=nikomatsakis	2020-11-15 13:39:43 +01:00
rustc_traits	Rollup merge of #78502 - matthewjasper:chalkup, r=nikomatsakis	2020-11-09 19:06:46 +01:00
rustc_ty
rustc_typeck	Rollup merge of #77802 - jyn514:bootstrap-specific, r=nikomatsakis	2020-11-15 13:39:43 +01:00