Michael Schimmel
9b16bc47be
This commit introduces several improvements: - Pre-compiles regular expressions in `ast/tester.rs` to avoid redundant compilation, improving performance. - Replaces `.extension().map_or(false, |ext| ext == "myc")` with the more concise and readable `.extension().is_some_and(|ext| ext == "myc")`. - Simplifies upvalue capture logic by using `.or_default()` instead of `.or_insert_with(HashSet::new)`. - Adds a `Default` implementation for `TracingObserver`. - Optimizes string literal parsing in `highlight_myc` to correctly handle escape sequences. - Uses `saturating_sub` for bracket depth to prevent underflow.