Merge pull request #4498 from katediadechko/ignore-rust-mutants

Ignore cargo-mutants output

Rust.gitignore

@@ -9,6 +9,10 @@ target/
 # MSVC Windows builds of rustc generate these, which store debugging information
 *.pdb
 
+# Generated by cargo mutants
+# Contains mutation testing data
+**/mutants.out*/
+
 # RustRover
 #  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
 #  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore