You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: lib.rs
    path of file: ./repos/stc/crates/stc_ts_type_ops/src
    
    the code of the file until where you have to start completion: //! Operations related to types.
//!
//! This crate exists to reduce compile time.
#![feature(box_pat
    
    fn visit_mut(&mut self, ty: &mut Type) {
        // TODO(kdy1): PERF
        ty.normalize_mut();
        ty.metadata_mut().prevent_complex_simplification = true;

        ty.visit_mut_children_with(self);
    }