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Don't see {{}} as placeholder in panic_fmt lint.

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This commit is contained in:
Mara Bos 2020-10-19 00:05:19 +02:00
parent dd262e3856
commit 9615d27ab7
1 changed files with 7 additions and 8 deletions
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15
compiler/rustc_lint/src/panic_fmt.rs
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@ -47,19 +47,18 @@ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'tcx>) {
fn check_panic<'tcx>(cx: &LateContext<'tcx>, f: &'tcx hir::Expr<'tcx>, arg: &'tcx hir::Expr<'tcx>) {
if let hir::ExprKind::Lit(lit) = &arg.kind {
if let ast::LitKind::Str(sym, _) = lit.node {
let s = sym.as_str();
let open = s.find('{');
let close = s[open.unwrap_or(0)..].find('}');
let looks_like_placeholder = match (open, close) {
(Some(_), Some(_)) => true,
(Some(_), None) | (None, Some(_)) => false,
(None, None) => return, // OK, no braces.
};
let expn = f.span.ctxt().outer_expn_data();
if let Some(id) = expn.macro_def_id {
if cx.tcx.is_diagnostic_item(sym::std_panic_macro, id)
|| cx.tcx.is_diagnostic_item(sym::core_panic_macro, id)
{
let s = sym.as_str();
if !s.contains(&['{', '}'][..]) {
return;
}
let s = s.replace("{{", "").replace("}}", "");
let looks_like_placeholder =
s.find('{').map_or(false, |i| s[i + 1..].contains('}'));
let expn = {
// Unwrap another level of macro expansion if this
// panic!() was expanded from assert!().