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Suggest ! for bitwise negation when encountering a ~

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This commit is contained in:
F001
2017-05-02 23:31:47 -07:00
parent 4d81b14b80
commit a9d3b3498e
3 changed files with 36 additions and 0 deletions
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13
src/libsyntax/parse/parser.rs
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@@ -2700,6 +2700,19 @@ impl<'a> Parser<'a> {
let (span, e) = self.interpolated_or_expr_span(e)?;
(span, self.mk_unary(UnOp::Not, e))
}
// Suggest `!` for bitwise negation when encountering a `~`
token::Tilde => {
self.bump();
let e = self.parse_prefix_expr(None);
let (span, e) = self.interpolated_or_expr_span(e)?;
let span_of_tilde = lo;
let mut err = self.diagnostic().struct_span_err(span_of_tilde,
"`~` can not be used as an unary operator");
err.span_label(span_of_tilde, &"did you mean `!`?");
err.help("use `!` instead of `~` if you meant to perform bitwise negation");
err.emit();
(span, self.mk_unary(UnOp::Not, e))
}
token::BinOp(token::Minus) => {
self.bump();
let e = self.parse_prefix_expr(None);