proc-macro2-diagnostics 0.10.1

Diagnostics for proc-macro2.
Documentation 
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#[test]
fn main() {
    let t = trybuild::TestCases::new();

    #[cfg(not(nightly_diagnostics))]
    t.compile_fail("tests/stable/*.rs");

    #[cfg(nightly_diagnostics)]
    t.compile_fail("tests/nightly/*.rs");
}