Add new run_make_support::CompletedProcess::assert_ice method

src/tools/run-make-support/src/command.rs

@@ -387,6 +387,13 @@ pub fn assert_stderr_not_contains<S: AsRef<str>>(&self, unexpected: S) -> &Self
         self
     }
 
+    /// Checks that `stderr` doesn't contain the Internal Compiler Error message.
+    #[track_caller]
+    pub fn assert_not_ice(&self) -> &Self {
+        self.assert_stderr_not_contains("error: the compiler unexpectedly panicked. this is a bug");
+        self
+    }
+
     /// Checks that `stderr` does not contain the regex pattern `unexpected`.
     #[track_caller]
     pub fn assert_stderr_not_contains_regex<S: AsRef<str>>(&self, unexpected: S) -> &Self {

tests/run-make/diagnostics-traits-from-duplicate-crates/rmake.rs

@@ -43,5 +43,5 @@ fn main() {
         .extern_("minibevy", "libminibevy-b.rmeta")
         .extern_("minirapier", "libminirapier.rmeta")
         .run_fail()
-        .assert_stderr_not_contains("error: the compiler unexpectedly panicked. this is a bug");
+        .assert_not_ice();
 }

tests/run-make/rustdoc-merge-no-input-finalize/rmake.rs

@@ -24,5 +24,5 @@ fn main() {
         .arg(format!("--include-parts-dir={}", parts_out_dir.display()))
         .arg("--merge=finalize")
         .run();
-    output.assert_stderr_not_contains("error: the compiler unexpectedly panicked. this is a bug.");
+    output.assert_not_ice();
 }

tests/run-make/rustdoc-test-builder/rmake.rs

@@ -15,9 +15,8 @@ fn main() {
         .arg(&absolute_path)
         .run_fail();
 
-    // We also double-check that we don't have the panic text in the output.
+    // We check that rustdoc outputs the error correctly...
     output.assert_stdout_contains("Failed to spawn ");
-    output.assert_stderr_not_contains("the compiler unexpectedly panicked. this is a bug.");
-    // Just in case...
-    output.assert_stdout_not_contains("the compiler unexpectedly panicked. this is a bug.");
+    // ... and that we didn't panic.
+    output.assert_not_ice();
 }