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Delete an unreachable codepath from format_args implementation #91327

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Merged
merged 1 commit into from
Nov 29, 2021
Merged

Delete an unreachable codepath from format_args implementation #91327

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12 changes: 4 additions & 8 deletions compiler/rustc_builtin_macros/src/format.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -88,8 +88,8 @@ struct Context<'a, 'b> {
/// * Implicit argument resolution: `"{1:.0$} {2:.foo$} {1:.3$} {4:.0$}"`
/// * Name resolution: `"{1:.0$} {2:.5$} {1:.3$} {4:.0$}"`
/// * `count_positions` (in JSON): `{0: 0, 5: 1, 3: 2}`
/// * `count_args`: `vec![Exact(0), Exact(5), Exact(3)]`
count_args: Vec<Position>,
/// * `count_args`: `vec![0, 5, 3]`
count_args: Vec<usize>,
/// Relative slot numbers for count arguments.
count_positions: FxHashMap<usize, usize>,
/// Number of count slots assigned.
Expand Down Expand Up @@ -513,7 +513,7 @@ impl<'a, 'b> Context<'a, 'b> {
if let Entry::Vacant(e) = self.count_positions.entry(arg) {
let i = self.count_positions_count;
e.insert(i);
self.count_args.push(Exact(arg));
self.count_args.push(arg);
self.count_positions_count += 1;
}
}
Expand Down Expand Up @@ -771,11 +771,7 @@ impl<'a, 'b> Context<'a, 'b> {
}
heads.push(self.ecx.expr_addr_of(e.span, e));
}
for pos in self.count_args {
let index = match pos {
Exact(i) => i,
_ => panic!("should never happen"),
};
for index in self.count_args {
let span = spans_pos[index];
args.push(Context::format_arg(self.ecx, self.macsp, span, &Count, index));
}
Expand Down