Jonathan Brouwer b9f8e25f6e Rollup merge of #146961 - Jules-Bertholet:expr-cfg, r=JonathanBrouwer ...

Allow passing `expr` metavariable as `cfg` predicate

This PR allows expanding `expr` metavariables inside the configuration predicates of `cfg` and `cfg_attr` invocations.
For example, the following code will now compile:

```rust
macro_rules! mac {
    ($e:expr) => {
        #[cfg_attr($e, inline)]
        #[cfg($e)]
        fn func() {}

        #[cfg(not($e))]
        fn func() {
            panic!()
        }
    }
}

mac!(any(unix, feature = "foo"));
```

There is currently no `macro_rules` fragment specifier that can represent all valid `cfg` predicates. `meta` comes closest, but excludes `true` and `false`. By fixing that, this change makes it easier to write declarative macros that parse `cfg` or `cfg_attr` invocations, for example https://github.com/rust-lang/rust/pull/146281/.

@rustbot label T-lang needs-fcp A-attributes A-cfg A-macros

2026-03-21 00:42:47 +01:00

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macro-missing-fragment.rs

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macro-missing-fragment.stderr

…

macro-multiple-items.rs

…

macro-multiple-matcher-bindings.rs

…

macro-multiple-matcher-bindings.stderr

…

macro-name-typo.rs

…

macro-name-typo.stderr

Make typo in field and name suggestions verbose

2025-12-09 17:29:23 +00:00

macro-named-default.rs

…

macro-nested_definition_issue-31946.rs

…

macro-nested_expr.rs

…

macro-nested_stmt_macros.rs

…

macro-non-lifetime.rs

…

macro-non-lifetime.stderr

…

macro-nt-list.rs

…

macro-of-higher-order.rs

…

macro-or-patterns-back-compat.fixed

Gate 2015 UI tests

2025-11-27 11:19:00 -05:00

macro-or-patterns-back-compat.rs

Gate 2015 UI tests

2025-11-27 11:19:00 -05:00

macro-or-patterns-back-compat.stderr

Gate 2015 UI tests

2025-11-27 11:19:00 -05:00

macro-outer-attributes.rs

Gate 2015 UI tests

2025-11-27 11:19:00 -05:00

macro-outer-attributes.stderr

Gate 2015 UI tests

2025-11-27 11:19:00 -05:00

macro-parameter-span.rs

…

macro-parameter-span.stderr

…

macro-paren-span-diagnostic.rs

…

macro-paren-span-diagnostic.stderr

…

macro-pat2021-pattern-followed-by-or.rs

…

macro-pat2021-pattern-followed-by-or.stderr

…

macro-pat-follow-2018.rs

…

macro-pat-follow.rs

…

macro-pat-neg-lit.rs

…

macro-pat-pattern-followed-by-or-in-2021.rs

…

macro-pat-pattern-followed-by-or-in-2021.stderr

…

macro-pat-pattern-followed-by-or.rs

Gate 2018 UI tests

2025-11-27 14:13:58 -05:00

macro-pat.rs

…

macro-path-prelude-fail-1.rs

Unify wording of resolve error

2026-02-17 16:51:44 +00:00

macro-path-prelude-fail-1.stderr

Unify wording of resolve error

2026-02-17 16:51:44 +00:00

macro-path-prelude-fail-2.rs

Unify wording of resolve error

2026-02-17 16:51:44 +00:00

macro-path-prelude-fail-2.stderr

Unify wording of resolve error

2026-02-17 16:51:44 +00:00

macro-path-prelude-fail-3.rs

…

macro-path-prelude-fail-3.stderr

Make typo in field and name suggestions verbose

2025-12-09 17:29:23 +00:00

macro-path-prelude-fail-4.rs

…

macro-path-prelude-fail-4.stderr

…

macro-path-prelude-fail-5.rs

…

macro-path-prelude-fail-5.stderr

…

macro-path-prelude-pass.rs

…

macro-path-prelude-shadowing.rs

Gate 2015 UI tests

2025-11-27 11:19:00 -05:00

macro-path-prelude-shadowing.stderr

Gate 2015 UI tests

2025-11-27 11:19:00 -05:00

macro-path-type-bounds-8521.rs

…

macro-path.rs

…

macro-pub-matcher.rs

…

macro-quote-test.rs

…

macro-reexport-removed.rs

…

macro-reexport-removed.stderr

Make typo in field and name suggestions verbose

2025-12-09 17:29:23 +00:00

macro-rules-as-derive-or-attr-issue-132928.rs

resolve: Remove force parameter from resolve_ident_in_scope

2026-01-30 21:32:37 +03:00

macro-rules-as-derive-or-attr-issue-132928.stderr

resolve: Remove force parameter from resolve_ident_in_scope

2026-01-30 21:32:37 +03:00

macro-rules-attr-error.rs

…

macro-rules-attr-error.stderr

…

macro-rules-attr-infinite-recursion.rs

…

macro-rules-attr-infinite-recursion.stderr

…

macro-rules-attr-nested.rs

…

macro-rules-attr-nested.run.stdout

…

macro-rules-attr.rs

Gate 2015 UI tests

2025-11-27 11:19:00 -05:00

macro-rules-attr.run.stdout

…

macro-rules-attr.stderr

Gate 2015 UI tests

2025-11-27 11:19:00 -05:00

macro-rules-derive-error.rs

…

macro-rules-derive-error.stderr

…

macro-rules-derive.rs

…

macro-rules-derive.run.stdout

…

macro-self-mutability-7911.rs

…

macro-self-mutability-7911.stderr

…

macro-seq-followed-by-seq.rs

…

macro-shadowing-relaxed.rs

…

macro-shadowing.rs

…

macro-shadowing.stderr

…

macro-span-issue-116502.rs

…

macro-span-issue-116502.stderr

…

macro-stability-rpass.rs

…

macro-stability.rs

…

macro-stability.stderr

…

macro-stmt_macro_in_expr_macro.rs

…

macro-stmt-2.rs

…

macro-stmt-matchers.rs

…

macro-stmt.rs

…

macro-tt-followed-by-seq.rs

…

macro-tt-matchers.rs

…

macro-use-all-and-none.rs

…

macro-use-all-and-none.stderr

…

macro-use-all.rs

…

macro-use-bad-args-1.rs

…

macro-use-bad-args-1.stderr

…

macro-use-bad-args-2.rs

…

macro-use-bad-args-2.stderr

…

macro-use-both.rs

…

macro-use-empty.rs

Move some ui tests

2026-03-09 09:11:06 +00:00

macro-use-empty.stderr

Move some ui tests

2026-03-09 09:11:06 +00:00

macro-use-one.rs

…

macro-use-scope.rs

…

macro-use-undef.rs

…

macro-use-undef.stderr

…

macro-use-wrong-name.rs

…

macro-use-wrong-name.stderr

…

macro-variable-declaration-with-bounds-5554.rs

…

macro-variable-unused-reporting-5718.rs

…

macro-with-attrs1.rs

…

macro-with-attrs2.rs

…

macro-with-braces-in-expr-position.rs

…

macros-in-extern.rs

…

macros-in-trait-positions-issue-40845.rs

…

macros-in-trait-positions-issue-40845.stderr

…

macros-nonfatal-errors.rs

…

macros-nonfatal-errors.stderr

…

malformed_macro_lhs.rs

…

malformed_macro_lhs.stderr

…

meta-item-absolute-path.rs

Unify wording of resolve error

2026-02-17 16:51:44 +00:00

meta-item-absolute-path.stderr

Unify wording of resolve error

2026-02-17 16:51:44 +00:00

meta-variable-depth-outside-repeat.rs

…

meta-variable-depth-outside-repeat.stderr

…

meta-variable-misuse.rs

…

metavar_cross_edition_recursive_macros.rs

Remove unused features in tests

2026-03-04 08:06:45 +08:00

missing-bang-in-decl.fixed

…

missing-bang-in-decl.rs

…

missing-bang-in-decl.stderr

…

missing-comma.rs

…

missing-comma.stderr

…

missing-derive-1.rs

…

missing-derive-1.stderr

…

missing-derive-2.rs

…

missing-derive-2.stderr

…

missing-derive-3.rs

…

missing-derive-3.stderr

…

missing-semi.rs

…

missing-semi.stderr

…

missing-writer-issue-139830.rs

…

missing-writer-issue-139830.stderr

…

missing-writer.rs

…

missing-writer.stderr

…

module-macro_use-arguments.rs

…

module-macro_use-arguments.stderr

…

must-use-in-macro-55516.rs

…

must-use-in-macro-55516.stderr

…

nested-macro-expansion.rs

…

nested-use-as.rs

…

no-close-delim-issue-139248.rs

…

no-close-delim-issue-139248.stderr

…

no-matching-rule.rs

Gate 2018 UI tests

2025-11-27 14:13:58 -05:00

no-matching-rule.stderr

Gate 2018 UI tests

2025-11-27 14:13:58 -05:00

no-patterns-in-args-macro.rs

…

no-patterns-in-args-macro.stderr

…

no-std-macros.rs

Gate 2015 UI tests

2025-11-27 11:19:00 -05:00

non-fmt-panic.fixed

Gate 2018 UI tests

2025-11-27 14:13:58 -05:00

non-fmt-panic.rs

Gate 2018 UI tests

2025-11-27 14:13:58 -05:00

non-fmt-panic.stderr

Create new Diagnostic type for panic calls without literals

2026-03-05 12:12:31 +01:00

none-delim-lookahead.rs

…

nonterminal-matching.rs

…

nonterminal-matching.stderr

…

not-utf8.bin

…

not-utf8.rs

…

not-utf8.stderr

…

out-of-order-shadowing.rs

…

out-of-order-shadowing.stderr

…

out-of-scope-calls-false-positives.rs

…

out-of-scope-macro-calls-lint-registered.rs

…

panic-temporaries-2018.rs

…

panic-temporaries.rs

…

paren-or-brace-expected.rs

…

paren-or-brace-expected.stderr

…

parse-complex-macro-invoc-op.rs

remove #![allow(stable_features)] from most tests

2026-02-17 08:45:08 +00:00

paths-in-macro-invocations.rs

…

println-percent-prefix-num-issue-125002.rs

…

println-percent-prefix-num-issue-125002.stderr

…

private-struct-member-macro-access-25386.rs

…

private-struct-member-macro-access-25386.stderr

…

proc_macro.rs

…

pub-item-inside-macro.rs

…

pub-method-inside-macro.rs

…

recovery-allowed.rs

…

recovery-allowed.stderr

…

recovery-forbidden.rs

…

remove-repetition-issue-139480.rs

…

remove-repetition-issue-139480.stderr

…

reparse-expr-issue-139495.rs

…

reparse-expr-issue-139495.stderr

…

restricted-shadowing-legacy.rs

…

restricted-shadowing-legacy.stderr

…

restricted-shadowing-modern.rs

…

restricted-shadowing-modern.stderr

…

return_from_external_macro.rs

…

return_from_external_macro.stderr

…

same-sequence-span.rs

…

same-sequence-span.stderr

…

semi-after-macro-ty.rs

…

span-covering-argument-1.rs

…

span-covering-argument-1.stderr

…

std-2024-macros.rs

…

stmt_expr_attr_macro_parse.rs

…

stringify.rs

Rollup merge of #152164 - mu001999-contrib:lint/unused_features, r=JonathanBrouwer

2026-03-04 19:30:36 +01:00

syntax-error-recovery.rs

…

syntax-error-recovery.stderr

…

syntax-extension-cfg.rs

…

syntax-extension-source-utils.rs

…

test-on-crate-root.rs

address review comments

2025-12-03 17:01:49 +01:00

test-on-crate-root.stderr

address review comments

2025-12-03 17:01:49 +01:00

tokenstream-ice-issue-149954.rs

Handle unbalanced delimiters gracefully in make_attr_token_stream

2026-02-01 13:16:32 +00:00

tokenstream-ice-issue-149954.stderr

Handle unbalanced delimiters gracefully in make_attr_token_stream

2026-02-01 13:16:32 +00:00

trace_faulty_macros.rs

…

trace_faulty_macros.stderr

…

trace_macros-format.rs

…

trace_macros-format.stderr

…

trace-macro.rs

…

trace-macro.stderr

…

try-macro.rs

…

two-macro-use.rs

…

type-macros-hlist.rs

…

type-macros-simple.rs

…

typeck-macro-interaction-issue-8852.rs

…

typo-in-repeat-expr-2.rs

rustc_expand: improve diagnostics for non-repeatable metavars in repetition

2026-02-18 20:14:36 +05:30

typo-in-repeat-expr-2.stderr

rustc_expand: improve diagnostics for non-repeatable metavars in repetition

2026-02-18 20:14:36 +05:30

typo-in-repeat-expr.fixed

rustc_expand: improve diagnostics for non-repeatable metavars in repetition

2026-02-18 20:14:36 +05:30

typo-in-repeat-expr.rs

rustc_expand: improve diagnostics for non-repeatable metavars in repetition

2026-02-18 20:14:36 +05:30

typo-in-repeat-expr.stderr

rustc_expand: improve diagnostics for non-repeatable metavars in repetition

2026-02-18 20:14:36 +05:30

undefined-macro-in-impl.rs

Cleaned up some tests

2025-12-16 02:10:08 +09:00

undefined-macro-in-impl.stderr

Cleaned up some tests

2025-12-16 02:10:08 +09:00

underscore.rs

dissolve tests/ui/cross

2026-03-16 10:21:35 +00:00

unimplemented-macro-panic.rs

…

unknown-builtin.rs

…

unknown-builtin.stderr

…

unreachable-arg.edition_2021.stderr

…

unreachable-arg.rs

…

unreachable-fmt-msg.rs

…

unreachable-format-arg.rs

…

unreachable-format-args.edition_2015.stderr

…

unreachable-format-args.rs

…

unreachable-macro-panic.rs

…

unreachable-static-msg.rs

…

use-macro-self.rs

…

user-defined-macro-rules.rs

…

vec-macro-in-pattern.rs

add write_box_via_move intrinsic and use it for vec!

2026-02-16 17:27:40 +01:00

vec-macro-in-pattern.stderr

add write_box_via_move intrinsic and use it for vec!

2026-02-16 17:27:40 +01:00

write-missing-destination.rs

Improve write! and writeln! error when called without destination

2026-02-11 20:37:45 -05:00

write-missing-destination.stderr

Improve write! and writeln! error when called without destination

2026-02-11 20:37:45 -05:00