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ty::pretty: document "dummy Span extern crate" special-case in try_print_visible_def_path_recur.

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Eduard-Mihai Burtescu 2021-10-10 18:18:30 +03:00
parent 9e8356c6ad
commit 152e40377a
1 changed files with 11 additions and 10 deletions
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21
compiler/rustc_middle/src/ty/print/pretty.rs
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@ -350,18 +350,19 @@ pub trait PrettyPrinter<'tcx>:
match self.tcx().extern_crate(def_id) {
Some(&ExternCrate { src, dependency_of, span, .. }) => match (src, dependency_of) {
(ExternCrateSource::Extern(def_id), LOCAL_CRATE) => {
debug!("try_print_visible_def_path: def_id={:?}", def_id);
return Ok((
if !span.is_dummy() {
self.print_def_path(def_id, &[])?
} else {
self.path_crate(cnum)?
},
true,
));
// NOTE(eddyb) the only reason `span` might be dummy,
// that we're aware of, is that it's the `std`/`core`
// `extern crate` injected by default.
// FIXME(eddyb) find something better to key this on,
// or avoid ending up with `ExternCrateSource::Extern`,
// for the injected `std`/`core`.
if span.is_dummy() {
return Ok((self.path_crate(cnum)?, true));
}
return Ok((self.print_def_path(def_id, &[])?, true));
}
(ExternCrateSource::Path, LOCAL_CRATE) => {
debug!("try_print_visible_def_path: def_id={:?}", def_id);
return Ok((self.path_crate(cnum)?, true));
}
_ => {}