Rollup merge of rust-lang#144297 - GuillaumeGomez:ERROR_EXIT_CODE, r=Amanieu

Make `libtest::ERROR_EXIT_CODE` const public to not redefine it in rustdoc

I think it's better to make this constant public so it can be used by crates using `libtest` as dependency.

As a side-note, I will update rust-lang#143900 to make use of this constant once this is current PR is merged.

Author: samueltardieu

test/src/lib.rs

@@ -89,8 +89,8 @@ use options::RunStrategy;
 use test_result::*;
 use time::TestExecTime;
 
-// Process exit code to be used to indicate test failures.
-const ERROR_EXIT_CODE: i32 = 101;
+/// Process exit code to be used to indicate test failures.
+pub const ERROR_EXIT_CODE: i32 = 101;
 
 const SECONDARY_TEST_INVOKER_VAR: &str = "__RUST_TEST_INVOKE";
 const SECONDARY_TEST_BENCH_BENCHMARKS_VAR: &str = "__RUST_TEST_BENCH_BENCHMARKS";