bjoernager/rust
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Improve panic_fmt lint messages.

Browse source 
(From the PR feedback.)

Co-authored-by: Esteban Küber <esteban@kuber.com.ar>
This commit is contained in:
Mara Bos 2020-10-29 19:44:06 +01:00
parent 5cefc3ce41
commit 9743f67684
2 changed files with 15 additions and 15 deletions
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10
compiler/rustc_lint/src/panic_fmt.rs
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@ -1,6 +1,6 @@
use crate::{LateContext, LateLintPass, LintContext};
use rustc_ast as ast;
use rustc_errors::Applicability;
use rustc_errors::{pluralize, Applicability};
use rustc_hir as hir;
use rustc_middle::ty;
use rustc_parse_format::{ParseMode, Parser, Piece};
@ -21,7 +21,7 @@ declare_lint! {
///
/// `panic!("{}")` panics with the message `"{}"`, as a `panic!()` invocation
/// with a single argument does not use `format_args!()`.
/// A future version of Rust will interpret this string as format string,
/// A future edition of Rust will interpret this string as format string,
/// which would break this.
PANIC_FMT,
Warn,
@ -97,11 +97,11 @@ fn check_panic<'tcx>(cx: &LateContext<'tcx>, f: &'tcx hir::Expr<'tcx>, arg: &'tc
1 => "panic message contains an unused formatting placeholder",
_ => "panic message contains unused formatting placeholders",
});
l.note("this message is not used as a format string when given without arguments, but will be in a future Rust version");
l.note("this message is not used as a format string when given without arguments, but will be in a future Rust edition");
if expn.call_site.contains(arg.span) {
l.span_suggestion(
arg.span.shrink_to_hi(),
"add the missing argument(s)",
&format!("add the missing argument{}", pluralize!(n_arguments)),
", ...".into(),
Applicability::HasPlaceholders,
);
@ -131,7 +131,7 @@ fn check_panic<'tcx>(cx: &LateContext<'tcx>, f: &'tcx hir::Expr<'tcx>, arg: &'tc
};
cx.struct_span_lint(PANIC_FMT, brace_spans.unwrap_or(vec![expn.call_site]), |lint| {
let mut l = lint.build(msg);
l.note("this message is not used as a format string, but will be in a future Rust version");
l.note("this message is not used as a format string, but will be in a future Rust edition");
if expn.call_site.contains(arg.span) {
l.span_suggestion(
arg.span.shrink_to_lo(),