Rust patterns

• comments matches comments
• crates matches crate lines
• enums matches enum definitions
• fns matches function definitions
• impls matches implementation definitions
• macros matches macro_rules! definitions
• mods matches module definitions
• names matches identifiers (and keywords) not inside strings and comments
• strings matches strings
• structs matches struct definitions
• traits matches trait definitions
• unions matches union definitions
• uses matches use lines
• zap_comments removes comments from matches
• zap_strings removes strings from matches