proc_macro2_diagnostic 0.3.1

Use `Diagnostic` compiler messages from proc_macro2 code with Result-like syntax.
Documentation 
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use trybuild::{self, TestCases};

#[test]
fn failures() {
    let t = TestCases::new();
    t.compile_fail("tests/compilation/examples/fail_*.rs");
}

#[test]
fn ok() {
    let t = TestCases::new();
    t.pass("tests/compilation/examples/pass_*.rs");
}