bjoernager/rust
bjoernager/rust
1
Fork 0
Code Issues Pull requests Activity

Recover with suggestion from writing .42 instead of 0.42

Browse source
This commit is contained in:
Esteban Küber 2019-01-20 01:49:04 -08:00
parent b1f169fe7a
commit acbda76f23
3 changed files with 47 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

26
src/libsyntax/parse/parser.rs
View file

@ -1989,6 +1989,32 @@ impl<'a> Parser<'a> {
result.unwrap()
}
token::Dot if self.look_ahead(1, |t| match t {
token::Literal(parse::token::Lit::Integer(_) , None) => true,
_ => false,
}) => { // recover from `let x = .4;`
let lo = self.span;
self.bump();
if let token::Literal(
parse::token::Lit::Integer(val),
None
) = self.token {
self.bump();
let sp = lo.to(self.prev_span);
let mut err = self.diagnostic()
.struct_span_err(sp, "numeric float literals must have a significant");
err.span_suggestion_with_applicability(
sp,
"numeric float literals must have a significant",
format!("0.{}", val),
Applicability::MachineApplicable,
);
err.emit();
return Ok(ast::LitKind::Float(val, ast::FloatTy::F32));
} else {
unreachable!();
};
}
_ => { return self.unexpected_last(&self.token); }
};