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Check the span's edition for the reserved prefixes.

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This commit is contained in:
Mara Bos 2021-06-14 16:48:07 +00:00 committed by lrh2000
parent 6adce70a58
commit d40be0fc64
1 changed files with 16 additions and 15 deletions
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31
compiler/rustc_parse/src/lexer/mod.rs
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@ -7,7 +7,6 @@ use rustc_lexer::{Base, DocStyle, RawStrError};
use rustc_session::lint::builtin::RESERVED_PREFIX;
use rustc_session::lint::BuiltinLintDiagnostics;
use rustc_session::parse::ParseSess;
use rustc_span::edition::Edition;
use rustc_span::symbol::{sym, Symbol};
use rustc_span::{BytePos, Pos, Span};
@ -508,7 +507,22 @@ impl<'a> StringReader<'a> {
let prefix_span = self.mk_sp(start, self.pos);
let msg = format!("prefix `{}` is unknown", self.str_from_to(start, self.pos));
if self.sess.edition < Edition::Edition2021 {
if prefix_span.rust_2021() {
// In Rust 2021, this is a hard error.
self.sess
.span_diagnostic
.struct_span_err(prefix_span, &msg)
.span_label(prefix_span, "unknown prefix")
.span_suggestion_verbose(
self.mk_sp(self.pos, self.pos),
"consider inserting whitespace here",
" ".into(),
Applicability::MachineApplicable,
)
.note("prefixed identifiers and literals are reserved since Rust 2021")
.emit();
} else {
// Before Rust 2021, only emit a lint for migration.
self.sess.buffer_lint_with_diagnostic(
&RESERVED_PREFIX,
prefix_span,
@ -516,20 +530,7 @@ impl<'a> StringReader<'a> {
&msg,
BuiltinLintDiagnostics::ReservedPrefix(prefix_span),
);
return;
}
let mut err = self.sess.span_diagnostic.struct_span_err(prefix_span, &msg);
err.span_label(prefix_span, "unknown prefix");
err.span_suggestion_verbose(
self.mk_sp(self.pos, self.pos),
"consider inserting whitespace here",
" ".into(),
Applicability::MachineApplicable,
);
err.note("prefixed identifiers and literals are reserved since Rust 2021");
err.emit();
}
/// Note: It was decided to not add a test case, because it would be too big.