Suggest `-Whelp` when pass `--print lints` to rustc

Signed-off-by: xizheyin <xizheyin@smail.nju.edu.cn>

1 files changed, 6 insertions, 0 deletions

diff --git a/compiler/rustc_session/src/config.rs b/compiler/rustc_session/src/config.rs
index 701d06e4fd4..43b78423c72 100644
--- a/compiler/rustc_session/src/config.rs
+++ b/compiler/rustc_session/src/config.rs
@@ -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()
 }