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Fix suggestion for removing &mut from &mut macro!().

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This commit is contained in:
Mara Bos 2021-06-02 19:06:23 +02:00
parent 716394d658
commit b4524f8bf0
1 changed files with 11 additions and 3 deletions
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14
compiler/rustc_typeck/src/check/demand.rs
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@ -16,6 +16,7 @@ use rustc_span::Span;
use super::method::probe;
use std::fmt;
use std::iter;
impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
pub fn emit_coerce_suggestions(
@ -577,12 +578,19 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
// We have `&T`, check if what was expected was `T`. If so,
// we may want to suggest removing a `&`.
if sm.is_imported(expr.span) {
if let Ok(src) = sm.span_to_snippet(sp) {
if let Some(src) = src.strip_prefix('&') {
// Go through the spans from which this span was expanded,
// and find the one that's pointing inside `sp`.
//
// E.g. for `&format!("")`, where we want the span to the
// `format!()` invocation instead of its expansion.
if let Some(call_span) =
iter::successors(Some(expr.span), |s| s.parent()).find(|&s| sp.contains(s))
{
if let Ok(code) = sm.span_to_snippet(call_span) {
return Some((
sp,
"consider removing the borrow",
src.to_string(),
code,
Applicability::MachineApplicable,
));
}