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kornelskikornelski
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debug-fmt-detail option
Allows disabling `fmt::Debug` derive and debug formatting.
1 parent 8cf135e commit 92cac91

32 files changed

+265
-56
lines changed

‎compiler/rustc_ast_lowering/src/format.rs

Lines changed: 5 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -5,6 +5,7 @@ use rustc_ast::visit::Visitor;
55
use rustc_ast::*;
66
use rustc_data_structures::fx::FxIndexMap;
77
use rustc_hir as hir;
8+
use rustc_session::config::DebugFmtDetail;
89
use rustc_span::{
910
sym,
1011
symbol::{kw, Ident},
@@ -245,7 +246,10 @@ fn make_argument<'hir>(
245246
hir::LangItem::FormatArgument,
246247
match ty {
247248
Format(Display) => sym::new_display,
248-
Format(Debug) => sym::new_debug,
249+
Format(Debug) => match ctx.tcx.sess.opts.unstable_opts.debug_fmt_detail {
250+
DebugFmtDetail::Full | DebugFmtDetail::Shallow => sym::new_debug,
251+
DebugFmtDetail::None => sym::new_debug_noop,
252+
},
249253
Format(LowerExp) => sym::new_lower_exp,
250254
Format(UpperExp) => sym::new_upper_exp,
251255
Format(Octal) => sym::new_octal,

‎compiler/rustc_builtin_macros/src/deriving/debug.rs

Lines changed: 13 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -4,6 +4,7 @@ use crate::deriving::path_std;
44

55
use rustc_ast::{self as ast, EnumDef, MetaItem};
66
use rustc_expand::base::{Annotatable, ExtCtxt};
7+
use rustc_session::config::DebugFmtDetail;
78
use rustc_span::symbol::{sym, Ident, Symbol};
89
use rustc_span::Span;
910
use thin_vec::{thin_vec, ThinVec};
@@ -49,6 +50,11 @@ fn show_substructure(cx: &ExtCtxt<'_>, span: Span, substr: &Substructure<'_>) ->
4950
// We want to make sure we have the ctxt set so that we can use unstable methods
5051
let span = cx.with_def_site_ctxt(span);
5152

53+
let fmt_detail = cx.sess.opts.unstable_opts.debug_fmt_detail;
54+
if fmt_detail == DebugFmtDetail::None {
55+
return BlockOrExpr::new_expr(cx.expr_ok(span, cx.expr_tuple(span, ThinVec::new())));
56+
}
57+
5258
let (ident, vdata, fields) = match substr.fields {
5359
Struct(vdata, fields) => (substr.type_ident, *vdata, fields),
5460
EnumMatching(_, v, fields) => (v.ident, &v.data, fields),
@@ -61,6 +67,13 @@ fn show_substructure(cx: &ExtCtxt<'_>, span: Span, substr: &Substructure<'_>) ->
6167
let name = cx.expr_str(span, ident.name);
6268
let fmt = substr.nonselflike_args[0].clone();
6369

70+
// Fieldless enums have been special-cased earlier
71+
if fmt_detail == DebugFmtDetail::Shallow {
72+
let fn_path_write_str = cx.std_path(&[sym::fmt, sym::Formatter, sym::write_str]);
73+
let expr = cx.expr_call_global(span, fn_path_write_str, thin_vec![fmt, name]);
74+
return BlockOrExpr::new_expr(expr);
75+
}
76+
6477
// Struct and tuples are similar enough that we use the same code for both,
6578
// with some extra pieces for structs due to the field names.
6679
let (is_struct, args_per_field) = match vdata {

‎compiler/rustc_feature/src/builtin_attrs.rs

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -38,6 +38,8 @@ const GATED_CFGS: &[GatedCfg] = &[
3838
(sym::relocation_model, sym::cfg_relocation_model, cfg_fn!(cfg_relocation_model)),
3939
(sym::sanitizer_cfi_generalize_pointers, sym::cfg_sanitizer_cfi, cfg_fn!(cfg_sanitizer_cfi)),
4040
(sym::sanitizer_cfi_normalize_integers, sym::cfg_sanitizer_cfi, cfg_fn!(cfg_sanitizer_cfi)),
41+
// this is consistent with naming of the compiler flag it's for
42+
(sym::debug_fmt_detail, sym::debug_fmt_detail, cfg_fn!(debug_fmt_detail)),
4143
];
4244

4345
/// Find a gated cfg determined by the `pred`icate which is given the cfg's name.

‎compiler/rustc_feature/src/unstable.rs

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -432,6 +432,8 @@ declare_features! (
432432
(unstable, custom_inner_attributes, "1.30.0", Some(54726)),
433433
/// Allows custom test frameworks with `#![test_runner]` and `#[test_case]`.
434434
(unstable, custom_test_frameworks, "1.30.0", Some(50297)),
435+
/// Disabling fmt::Debug
436+
(unstable, debug_fmt_detail, "CURRENT_RUSTC_VERSION", Some(123940)),
435437
/// Allows declarative macros 2.0 (`macro`).
436438
(unstable, decl_macro, "1.17.0", Some(39412)),
437439
/// Allows default type parameters to influence type inference.

‎compiler/rustc_interface/src/tests.rs

Lines changed: 7 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -4,12 +4,12 @@ use rustc_data_structures::profiling::TimePassesFormat;
44
use rustc_errors::{emitter::HumanReadableErrorType, registry, ColorConfig};
55
use rustc_session::config::{
66
build_configuration, build_session_options, rustc_optgroups, BranchProtection, CFGuard, Cfg,
7-
CollapseMacroDebuginfo, CoverageOptions, DebugInfo, DumpMonoStatsFormat, ErrorOutputType,
8-
ExternEntry, ExternLocation, Externs, FunctionReturn, InliningThreshold, Input,
9-
InstrumentCoverage, InstrumentXRay, LinkSelfContained, LinkerPluginLto, LocationDetail, LtoCli,
10-
NextSolverConfig, OomStrategy, Options, OutFileName, OutputType, OutputTypes, PAuthKey, PacRet,
11-
Passes, Polonius, ProcMacroExecutionStrategy, Strip, SwitchWithOptPath, SymbolManglingVersion,
12-
WasiExecModel,
7+
CollapseMacroDebuginfo, CoverageOptions, DebugFmtDetail, DebugInfo, DumpMonoStatsFormat,
8+
ErrorOutputType, ExternEntry, ExternLocation, Externs, FunctionReturn, InliningThreshold,
9+
Input, InstrumentCoverage, InstrumentXRay, LinkSelfContained, LinkerPluginLto, LocationDetail,
10+
LtoCli, NextSolverConfig, OomStrategy, Options, OutFileName, OutputType, OutputTypes, PAuthKey,
11+
PacRet, Passes, Polonius, ProcMacroExecutionStrategy, Strip, SwitchWithOptPath,
12+
SymbolManglingVersion, WasiExecModel,
1313
};
1414
use rustc_session::lint::Level;
1515
use rustc_session::search_paths::SearchPath;
@@ -763,6 +763,7 @@ fn test_unstable_options_tracking_hash() {
763763
tracked!(coverage_options, CoverageOptions { branch: true, mcdc: true });
764764
tracked!(crate_attr, vec!["abc".to_string()]);
765765
tracked!(cross_crate_inline_threshold, InliningThreshold::Always);
766+
tracked!(debug_fmt_detail, DebugFmtDetail::Shallow);
766767
tracked!(debug_info_for_profiling, true);
767768
tracked!(debug_macros, true);
768769
tracked!(default_hidden_visibility, Some(true));

‎compiler/rustc_session/src/config.rs

Lines changed: 25 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -17,7 +17,9 @@ use rustc_errors::{ColorConfig, DiagArgValue, DiagCtxtFlags, IntoDiagArg};
1717
use rustc_feature::UnstableFeatures;
1818
use rustc_span::edition::{Edition, DEFAULT_EDITION, EDITION_NAME_LIST, LATEST_STABLE_EDITION};
1919
use rustc_span::source_map::FilePathMapping;
20-
use rustc_span::{FileName, FileNameDisplayPreference, RealFileName, SourceFileHashAlgorithm};
20+
use rustc_span::{
21+
sym, FileName, FileNameDisplayPreference, RealFileName, SourceFileHashAlgorithm, Symbol,
22+
};
2123
use rustc_target::spec::{LinkSelfContainedComponents, LinkerFeatures};
2224
use rustc_target::spec::{SplitDebuginfo, Target, TargetTriple};
2325
use std::collections::btree_map::{
@@ -362,6 +364,23 @@ impl LocationDetail {
362364
}
363365
}
364366

367+
/// Values for the `-Z debug-fmt-detail` flag.
368+
#[derive(Copy, Clone, PartialEq, Hash, Debug)]
369+
pub enum DebugFmtDetail {
370+
/// Derive fully-featured implementation
371+
Full,
372+
/// Print only type name, without fields
373+
Shallow,
374+
/// `#[derive(Debug)]` and `{:?}` are no-ops
375+
None,
376+
}
377+
378+
impl DebugFmtDetail {
379+
pub(crate) fn all() -> [Symbol; 3] {
380+
[sym::full, sym::none, sym::shallow]
381+
}
382+
}
383+
365384
#[derive(Clone, PartialEq, Hash, Debug)]
366385
pub enum SwitchWithOptPath {
367386
Enabled(Option<PathBuf>),
@@ -2868,10 +2887,10 @@ pub enum WasiExecModel {
28682887
pub(crate) mod dep_tracking {
28692888
use super::{
28702889
BranchProtection, CFGuard, CFProtection, CollapseMacroDebuginfo, CoverageOptions,
2871-
CrateType, DebugInfo, DebugInfoCompression, ErrorOutputType, FunctionReturn,
2872-
InliningThreshold, InstrumentCoverage, InstrumentXRay, LinkerPluginLto, LocationDetail,
2873-
LtoCli, NextSolverConfig, OomStrategy, OptLevel, OutFileName, OutputType, OutputTypes,
2874-
Polonius, RemapPathScopeComponents, ResolveDocLinks, SourceFileHashAlgorithm,
2890+
CrateType, DebugFmtDetail, DebugInfo, DebugInfoCompression, ErrorOutputType,
2891+
FunctionReturn, InliningThreshold, InstrumentCoverage, InstrumentXRay, LinkerPluginLto,
2892+
LocationDetail, LtoCli, NextSolverConfig, OomStrategy, OptLevel, OutFileName, OutputType,
2893+
OutputTypes, Polonius, RemapPathScopeComponents, ResolveDocLinks, SourceFileHashAlgorithm,
28752894
SplitDwarfKind, SwitchWithOptPath, SymbolManglingVersion, WasiExecModel,
28762895
};
28772896
use crate::lint;
@@ -2973,6 +2992,7 @@ pub(crate) mod dep_tracking {
29732992
OutputType,
29742993
RealFileName,
29752994
LocationDetail,
2995+
DebugFmtDetail,
29762996
BranchProtection,
29772997
OomStrategy,
29782998
LanguageIdentifier,

‎compiler/rustc_session/src/config/cfg.rs

Lines changed: 15 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -25,7 +25,7 @@ use rustc_target::abi::Align;
2525
use rustc_target::spec::{PanicStrategy, RelocModel, SanitizerSet};
2626
use rustc_target::spec::{Target, TargetTriple, TARGETS};
2727

28-
use crate::config::CrateType;
28+
use crate::config::{CrateType, DebugFmtDetail};
2929
use crate::Session;
3030

3131
use std::hash::Hash;
@@ -115,6 +115,18 @@ pub(crate) fn default_configuration(sess: &Session) -> Cfg {
115115
ins_none!(sym::debug_assertions);
116116
}
117117

118+
match sess.opts.unstable_opts.debug_fmt_detail {
119+
DebugFmtDetail::Full => {
120+
ins_sym!(sym::debug_fmt_detail, sym::full);
121+
}
122+
DebugFmtDetail::Shallow => {
123+
ins_sym!(sym::debug_fmt_detail, sym::shallow);
124+
}
125+
DebugFmtDetail::None => {
126+
ins_sym!(sym::debug_fmt_detail, sym::none);
127+
}
128+
}
129+
118130
if sess.overflow_checks() {
119131
ins_none!(sym::overflow_checks);
120132
}
@@ -262,6 +274,8 @@ impl CheckCfg {
262274

263275
ins!(sym::debug_assertions, no_values);
264276

277+
ins!(sym::debug_fmt_detail, empty_values).extend(DebugFmtDetail::all());
278+
265279
// These four are never set by rustc, but we set them anyway: they
266280
// should not trigger a lint because `cargo clippy`, `cargo doc`,
267281
// `cargo test` and `cargo miri run` (respectively) can set them.

‎compiler/rustc_session/src/options.rs

Lines changed: 14 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -408,6 +408,7 @@ mod desc {
408408
pub const parse_linker_plugin_lto: &str =
409409
"either a boolean (`yes`, `no`, `on`, `off`, etc), or the path to the linker plugin";
410410
pub const parse_location_detail: &str = "either `none`, or a comma separated list of location details to track: `file`, `line`, or `column`";
411+
pub const parse_debug_fmt_detail: &str = "either `full`, `shallow`, or `none`";
411412
pub const parse_switch_with_opt_path: &str =
412413
"an optional path to the profiling data output directory";
413414
pub const parse_merge_functions: &str = "one of: `disabled`, `trampolines`, or `aliases`";
@@ -588,6 +589,16 @@ mod parse {
588589
}
589590
}
590591

592+
pub(crate) fn parse_debug_fmt_detail(opt: &mut DebugFmtDetail, v: Option<&str>) -> bool {
593+
*opt = match v {
594+
Some("full") => DebugFmtDetail::Full,
595+
Some("shallow") => DebugFmtDetail::Shallow,
596+
Some("none") => DebugFmtDetail::None,
597+
_ => return false,
598+
};
599+
true
600+
}
601+
591602
pub(crate) fn parse_location_detail(ld: &mut LocationDetail, v: Option<&str>) -> bool {
592603
if let Some(v) = v {
593604
ld.line = false;
@@ -1622,6 +1633,9 @@ options! {
16221633
"inject the given attribute in the crate"),
16231634
cross_crate_inline_threshold: InliningThreshold = (InliningThreshold::Sometimes(100), parse_inlining_threshold, [TRACKED],
16241635
"threshold to allow cross crate inlining of functions"),
1636+
debug_fmt_detail: DebugFmtDetail = (DebugFmtDetail::Full, parse_debug_fmt_detail, [TRACKED],
1637+
"how detailed `#[derive(Debug)]` should be. `full` prints types recursively, \
1638+
`shallow` prints only type names, `none` prints nothing and disables `{:?}`. (default: `full`)"),
16251639
debug_info_for_profiling: bool = (false, parse_bool, [TRACKED],
16261640
"emit discriminators and other data necessary for AutoFDO"),
16271641
debug_macros: bool = (false, parse_bool, [TRACKED],

‎compiler/rustc_span/src/symbol.rs

Lines changed: 5 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -499,6 +499,7 @@ symbols! {
499499
cfg_accessible,
500500
cfg_attr,
501501
cfg_attr_multi,
502+
cfg_debug_fmt_detail,
502503
cfg_doctest,
503504
cfg_eval,
504505
cfg_hide,
@@ -658,6 +659,7 @@ symbols! {
658659
debug_assert_macro,
659660
debug_assert_ne_macro,
660661
debug_assertions,
662+
debug_fmt_detail,
661663
debug_struct,
662664
debug_struct_fields_finish,
663665
debug_tuple,
@@ -892,6 +894,7 @@ symbols! {
892894
fs_create_dir,
893895
fsub_algebraic,
894896
fsub_fast,
897+
full,
895898
fundamental,
896899
fused_iterator,
897900
future,
@@ -1228,6 +1231,7 @@ symbols! {
12281231
new_binary,
12291232
new_const,
12301233
new_debug,
1234+
new_debug_noop,
12311235
new_display,
12321236
new_lower_exp,
12331237
new_lower_hex,
@@ -1645,6 +1649,7 @@ symbols! {
16451649
self_struct_ctor,
16461650
semitransparent,
16471651
shadow_call_stack,
1652+
shallow,
16481653
shl,
16491654
shl_assign,
16501655
should_panic,

‎library/core/src/fmt/rt.rs

Lines changed: 4 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -117,6 +117,10 @@ impl<'a> Argument<'a> {
117117
Self::new(x, Debug::fmt)
118118
}
119119
#[inline(always)]
120+
pub fn new_debug_noop<'b, T: Debug>(x: &'b T) -> Argument<'_> {
121+
Self::new(x, |_, _| Ok(()))
122+
}
123+
#[inline(always)]
120124
pub fn new_octal<'b, T: Octal>(x: &'b T) -> Argument<'_> {
121125
Self::new(x, Octal::fmt)
122126
}

‎src/doc/unstable-book/src/compiler-flags/debug-fmt-detail.md

Lines changed: 15 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,15 @@
1+
# `debug-fmt-detail`
2+
3+
The tracking issue for this feature is: [#123940](https://github.com/rust-lang/rust/issues/123940).
4+
5+
------------------------
6+
7+
Option `-Z debug-fmt-detail=val` controls verbosity of derived `Debug` implementations
8+
and debug formatting in format strings (`{:?}`).
9+
10+
* `full` — `#[derive(Debug)]` prints types recursively. This is the default behavior.
11+
12+
* `shallow` — `#[derive(Debug)]` prints only the type name, or name of a variant of a fieldless enums. Details of the `Debug` implementation are not stable and may change in the future. Behavior of custom `fmt::Debug` implementations is not affected.
13+
14+
* `none` — `#[derive(Debug)]` does not print anything at all. `{:?}` in formatting strings has no effect.
15+
This option may reduce size of binaries, and remove occurrences of type names in the binary that are not removed by striping symbols. However, it may also cause `panic!` and `assert!` messages to be incomplete.

‎tests/ui/check-cfg/allow-same-level.stderr

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -4,7 +4,7 @@ warning: unexpected `cfg` condition name: `FALSE`
44
LL | #[cfg(FALSE)]
55
| ^^^^^
66
|
7-
= help: expected names are: `clippy`, `debug_assertions`, `doc`, `doctest`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `ub_checks`, `unix`, `windows`
7+
= help: expected names are: `clippy`, `debug_assertions`, `debug_fmt_detail`, `doc`, `doctest`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `ub_checks`, `unix`, `windows`
88
= help: to expect this configuration use `--check-cfg=cfg(FALSE)`
99
= note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
1010
= note: `#[warn(unexpected_cfgs)]` on by default

‎tests/ui/check-cfg/cargo-feature.none.stderr

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -25,7 +25,7 @@ warning: unexpected `cfg` condition name: `tokio_unstable`
2525
LL | #[cfg(tokio_unstable)]
2626
| ^^^^^^^^^^^^^^
2727
|
28-
= help: expected names are: `clippy`, `debug_assertions`, `doc`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `ub_checks`, `unix`, `windows`
28+
= help: expected names are: `clippy`, `debug_assertions`, `debug_fmt_detail`, `doc`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `ub_checks`, `unix`, `windows`
2929
= help: consider using a Cargo feature instead or adding `println!("cargo:rustc-check-cfg=cfg(tokio_unstable)");` to the top of a `build.rs`
3030
= note: see <https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#check-cfg> for more information about checking conditional configuration
3131

‎tests/ui/check-cfg/cargo-feature.some.stderr

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -25,7 +25,7 @@ warning: unexpected `cfg` condition name: `tokio_unstable`
2525
LL | #[cfg(tokio_unstable)]
2626
| ^^^^^^^^^^^^^^
2727
|
28-
= help: expected names are: `CONFIG_NVME`, `clippy`, `debug_assertions`, `doc`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `ub_checks`, `unix`, `windows`
28+
= help: expected names are: `CONFIG_NVME`, `clippy`, `debug_assertions`, `debug_fmt_detail`, `doc`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `ub_checks`, `unix`, `windows`
2929
= help: consider using a Cargo feature instead or adding `println!("cargo:rustc-check-cfg=cfg(tokio_unstable)");` to the top of a `build.rs`
3030
= note: see <https://doc.rust-lang.org/nightly/cargo/reference/unstable.html#check-cfg> for more information about checking conditional configuration
3131

‎tests/ui/check-cfg/cfg-value-for-cfg-name-duplicate.stderr

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -4,7 +4,7 @@ warning: unexpected `cfg` condition name: `value`
44
LL | #[cfg(value)]
55
| ^^^^^
66
|
7-
= help: expected names are: `bar`, `bee`, `clippy`, `cow`, `debug_assertions`, `doc`, `doctest`, `foo`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `ub_checks`, `unix`, `windows`
7+
= help: expected names are: `bar`, `bee`, `clippy`, `cow`, `debug_assertions`, `debug_fmt_detail`, `doc`, `doctest`, `foo`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `ub_checks`, `unix`, `windows`
88
= help: to expect this configuration use `--check-cfg=cfg(value)`
99
= note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg.html> for more information about checking conditional configuration
1010
= note: `#[warn(unexpected_cfgs)]` on by default

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