macro-lens 2.0.1

Provides support for lenses, which are a mechanism in functional programming for focusing on a part of a complex data structure.
Documentation 
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#[test]
fn ui_coverage_matches_supported_macro_shapes() {
    let t = trybuild::TestCases::new();
    t.pass("tests/ui/pass/*.rs");
    t.compile_fail("tests/ui/fail/*.rs");
}