Static rustc_ap_rustc_lint_defs::builtin::LARGE_ASSIGNMENTS

pub static LARGE_ASSIGNMENTS: &Lint

The large_assignments lint detects when objects of large types are being moved around.

Example

let x = [0; 50000];
let y = x;

produces:

warning: moving a large value
  --> $DIR/move-large.rs:1:3
  let y = x;
          - Copied large value here

Explanation

When using a large type in a plain assignment or in a function argument, idiomatic code can be inefficient. Ideally appropriate optimizations would resolve this, but such optimizations are only done in a best-effort manner. This lint will trigger on all sites of large moves and thus allow the user to resolve them in code.