Address rust-lang/rust#111748

Author: smoelius

cargo-dylint/tests/boundary_toolchains.rs

@@ -8,7 +8,10 @@ use test_log::test;
 // smoelius: The channel date is one day later than the `rustc --version` date.
 // smoelius: Put recent boundaries first, since they're more likely to cause problems.
 // smoelius: The relevant PRs and merge commits appear before each boundary.
-const BOUNDARIES: [(&str, &str); 4] = [
+const BOUNDARIES: [(&str, &str); 5] = [
+    // https://github.com/rust-lang/rust/pull/111748
+    // https://github.com/rust-lang/rust/commit/70e04bd88d85cab8ed110ace5a278fab106d0ef5
+    ("2023-05-29", "2023-05-30"),
     // https://github.com/rust-lang/rust/pull/111633
     // https://github.com/rust-lang/rust/commit/08efb9d652c840715d15954592426e2befe13b36
     ("2023-05-18", "2023-05-19"),

driver/src/lib.rs

@@ -1,4 +1,5 @@
 #![feature(rustc_private)]
+#![feature(string_leak)]
 #![deny(clippy::expect_used)]
 #![deny(clippy::unwrap_used)]
 #![deny(clippy::panic)]
@@ -119,14 +120,17 @@ impl Callbacks {
                 let lib = result.unwrap_or_else(|err| {
                     // smoelius: rust-lang/rust#111633 changed the type of `early_error`'s `msg`
                     // argument from `&str` to `impl Into<DiagnosticMessage>`.
+                    // smoelius: And rust-lang/rust#111748 made it that `msg` is borrowed for
+                    // `'static`. Since the program is about to exit, it's probably fine to leak the
+                    // string.
                     rustc_session::early_error(
                         rustc_session::config::ErrorOutputType::default(),
                         format!(
                             "could not load library `{}`: {}",
                             path.to_string_lossy(),
                             err
                         )
-                        .as_str(),
+                        .leak() as &str,
                     );
                 });
 

utils/linting/src/lib.rs

@@ -168,6 +168,7 @@
 //! [examples]: ../../examples
 
 #![feature(rustc_private)]
+#![feature(string_leak)]
 #![warn(unused_extern_crates)]
 
 #[allow(unused_extern_crates)]
@@ -457,7 +458,7 @@ pub fn init_config(sess: &rustc_session::Session) {
     try_init_config(sess).unwrap_or_else(|err| {
         rustc_session::early_error(
             rustc_session::config::ErrorOutputType::default(),
-            format!("could not read configuration file: {err}").as_str(),
+            format!("could not read configuration file: {err}").leak() as &str,
         );
     });
 }