mirror of https://github.com/rust-lang/rust
58 lines
1.5 KiB
Rust
58 lines
1.5 KiB
Rust
// Under the 2015 edition with the keyword_idents lint, `dyn` is
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// not entirely acceptable as an identifier.
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//
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// We currently do not attempt to detect or fix uses of `dyn` as an
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// identifier under a macro.
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//
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//@ check-pass
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//@ edition:2015
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#![allow(non_camel_case_types)]
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#![deny(keyword_idents)]
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mod outer_mod {
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pub mod r#dyn {
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pub struct r#dyn;
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}
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}
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// Here we are illustrating that the current lint does not flag the
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// occurrences of `dyn` in this macro definition; however, it
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// certainly *could* (and it would be nice if it did), since these
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// occurrences are not compatible with the 2018 edition's
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// interpretation of `dyn` as a keyword.
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macro_rules! defn_has_dyn_idents {
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() => { ::outer_mod::dyn::dyn }
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}
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struct X;
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trait Trait { fn hello(&self) { }}
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impl Trait for X { }
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macro_rules! tt_trait {
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($arg:tt) => { & $arg Trait }
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}
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macro_rules! id_trait {
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($id:ident) => { & $id Trait }
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}
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fn main() {
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defn_has_dyn_idents!();
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// Here we are illustrating that the current lint does not flag
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// the occurrences of `dyn` in these macro invocations. It
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// definitely should *not* flag the one in `tt_trait`, since that
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// is expanding in a valid fashion to `&dyn Trait`.
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//
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// It is arguable whether it would be valid to flag the occurrence
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// in `id_trait`, since that macro specifies that it takes an
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// `ident` as its input.
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fn f_tt(x: &X) -> tt_trait!(dyn) { x }
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fn f_id(x: &X) -> id_trait!(dyn) { x }
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let x = X;
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f_tt(&x).hello();
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f_id(&x).hello();
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}
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