Implement lint against `Symbol::intern` on a string literal

1 files changed, 9 insertions, 0 deletions

diff --git a/src/bootstrap/src/core/builder/cargo.rs b/src/bootstrap/src/core/builder/cargo.rs
index 0688a1d6892..13f351de20e 100644
--- a/src/bootstrap/src/core/builder/cargo.rs
+++ b/src/bootstrap/src/core/builder/cargo.rs
@@ -1030,6 +1030,15 @@ impl Builder<'_> {
 
         if mode == Mode::Rustc {
             rustflags.arg("-Wrustc::internal");
+            // cfg(bootstrap) - remove this check when lint is in bootstrap compiler
+            if stage != 0 {
+                // Lint is allow by default so downstream tools don't get a lit
+                // they can do nothing about
+                // We shouldn't be preinterning symbols used by tests
+                if cmd_kind != Kind::Test {
+                    rustflags.arg("-Drustc::symbol_intern_string_literal");
+                }
+            }
             // FIXME(edition_2024): Change this to `-Wrust_2024_idioms` when all
             // of the individual lints are satisfied.
             rustflags.arg("-Wkeyword_idents_2024");