From a9d3b3498e20a926d5b1662eb576d7db230ca110 Mon Sep 17 00:00:00 2001 From: F001 Date: Tue, 2 May 2017 23:31:47 -0700 Subject: Suggest `!` for bitwise negation when encountering a `~` --- src/libsyntax/parse/parser.rs | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'src/libsyntax/parse') diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs index d252963274e..f99f39dae6b 100644 --- a/src/libsyntax/parse/parser.rs +++ b/src/libsyntax/parse/parser.rs @@ -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); -- cgit 1.4.1-3-g733a5