Auto merge of #113450 - Nilstrieb:src/bootstrap/test.rs, r=flip1995

Fail the build if clippy tests don't pass

This was removed in
de69d556eb (diff-8479eab02701e686aedb15b567dc8fc31220c6e4efb9565ccc9d662b7fee2214) which caused CI to ignore clippy failures. This adds back the exit, which should cause CI to fail again if a test is broken (like right now, as clippy tests are broken on master).

Also see https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/CI.20doesn't.20care.20about.20clippy.20test.20failures.20but.20only.20sometime

r? flip1995

tests/ui/to_string_in_format_args_incremental.rs

@@ -1,9 +0,0 @@
-//@run-rustfix
-//@compile-flags: -C incremental=target/debug/test/incr
-
-// see https://github.com/rust-lang/rust-clippy/issues/10969
-
-fn main() {
-    let s = "Hello, world!";
-    println!("{}", s.to_string());
-}

tests/ui/to_string_in_format_args_incremental.stderr

@@ -1,10 +0,0 @@
-error: `to_string` applied to a type that implements `Display` in `println!` args
-  --> $DIR/to_string_in_format_args_incremental.rs:8:21
-   |
-LL |     println!("{}", s.to_string());
-   |                     ^^^^^^^^^^^^ help: remove this
-   |
-   = note: `-D clippy::to-string-in-format-args` implied by `-D warnings`
-
-error: aborting due to previous error
-