message: Fix tests when running with RUST_TEST_THREADS=1
diff: @@ -316,7 +316,7 @@ test test_hello ... FAILED
  failures:
  ---- test_hello stdout ----
  -[..]thread 'test_hello' panicked at 'assertion failed:[..]",
  +[..]thread '[..]' panicked at 'assertion failed:[..]",
  )
  .with_stdout_contains("[..]`(left == right)`[..]")
  .with_stdout_contains("[..]left: `\"hello\"`,[..]")
  @@ -366,7 +366,7 @@ test test_hello ... FAILED
  failures:
  ---- test_hello stdout ----
  -[..]thread 'test_hello' panicked at 'assertion failed: false', \
  +[..]thread '[..]' panicked at 'assertion failed: false', \
  tests/footest.rs:1[..]
  ",
  )
  @@ -402,7 +402,7 @@ test test_hello ... FAILED
  failures:
  ---- test_hello stdout ----
  -[..]thread 'test_hello' panicked at 'assertion failed: false', \
  +[..]thread '[..]' panicked at 'assertion failed: false', \
  src/lib.rs:1[..]
  ",
  )
  