bjoernager/rust
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Auto merge of #87246 - rust-lang:placeholder-pretty, r=nikomatsakis

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When pretty printing, name placeholders as bound regions

Split from #85499

When we see a placeholder that we are going to print, treat it as a bound var (and add it to a `for<...>`
This commit is contained in:
bors 2021-07-22 02:22:02 +00:00
commit 8024983ea7
8 changed files with 118 additions and 46 deletions
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2
compiler/rustc_infer/src/infer/error_reporting/mod.rs
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@ -995,7 +995,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
let get_lifetimes = |sig| {
use rustc_hir::def::Namespace;
let mut s = String::new();
let (_, (sig, reg)) = ty::print::FmtPrinter::new(self.tcx, &mut s, Namespace::TypeNS)
let (_, sig, reg) = ty::print::FmtPrinter::new(self.tcx, &mut s, Namespace::TypeNS)
.name_all_regions(sig)
.unwrap();
let lts: Vec<String> = reg.into_iter().map(|(_, kind)| kind.to_string()).collect();