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Suggest -Whelp when pass --print lints to rustc #138700

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Merged
merged 1 commit into from
Mar 21, 2025
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Merged

Suggest -Whelp when pass --print lints to rustc #138700

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6 changes: 6 additions & 0 deletions compiler/rustc_session/src/config.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2082,6 +2082,12 @@ fn emit_unknown_print_request_help(early_dcx: &EarlyDiagCtxt, req: &str) -> ! {
let mut diag = early_dcx.early_struct_fatal(format!("unknown print request: `{req}`"));
#[allow(rustc::diagnostic_outside_of_impl)]
diag.help(format!("valid print requests are: {prints}"));

if req == "lints" {
diag.help(format!("use `-Whelp` to print a list of lints"));
}

diag.help(format!("for more information, see the rustc book: https://doc.rust-lang.org/rustc/command-line-arguments.html#--print-print-compiler-information"));
diag.emit()
}

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1 change: 1 addition & 0 deletions tests/ui/invalid-compile-flags/print.stderr
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@@ -1,4 +1,5 @@
error: unknown print request: `yyyy`
|
= help: valid print requests are: `all-target-specs-json`, `calling-conventions`, `cfg`, `check-cfg`, `code-models`, `crate-name`, `deployment-target`, `file-names`, `host-tuple`, `link-args`, `native-static-libs`, `relocation-models`, `split-debuginfo`, `stack-protector-strategies`, `sysroot`, `target-cpus`, `target-features`, `target-libdir`, `target-list`, `target-spec-json`, `tls-models`
= help: for more information, see the rustc book: https://doc.rust-lang.org/rustc/command-line-arguments.html#--print-print-compiler-information

2 changes: 2 additions & 0 deletions tests/ui/rustc-print-info-issue-138612.rs
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@@ -0,0 +1,2 @@
//@ check-fail
//@ compile-flags: /dev/null --print lints
6 changes: 6 additions & 0 deletions tests/ui/rustc-print-info-issue-138612.stderr
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@@ -0,0 +1,6 @@
error: unknown print request: `lints`
|
= help: valid print requests are: `all-target-specs-json`, `calling-conventions`, `cfg`, `check-cfg`, `code-models`, `crate-name`, `deployment-target`, `file-names`, `host-tuple`, `link-args`, `native-static-libs`, `relocation-models`, `split-debuginfo`, `stack-protector-strategies`, `sysroot`, `target-cpus`, `target-features`, `target-libdir`, `target-list`, `target-spec-json`, `tls-models`
= help: use `-Whelp` to print a list of lints
= help: for more information, see the rustc book: https://doc.rust-lang.org/rustc/command-line-arguments.html#--print-print-compiler-information

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