bjoernager/rust
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Check for else keyword on missing if condition

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This commit is contained in:
Esteban Küber 2017-08-17 12:14:35 -07:00
parent c4672f8e87
commit 20a2716206
3 changed files with 12 additions and 29 deletions
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27
src/libsyntax/parse/parser.rs
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@ -2130,7 +2130,7 @@ impl<'a> Parser<'a> {
return self.parse_lambda_expr(lo, CaptureBy::Value, attrs);
}
if self.eat_keyword(keywords::If) {
return self.parse_if_expr(attrs, false);
return self.parse_if_expr(attrs);
}
if self.eat_keyword(keywords::For) {
let lo = self.prev_span;
@ -2962,25 +2962,20 @@ impl<'a> Parser<'a> {
}
/// Parse an 'if' or 'if let' expression ('if' token already eaten)
pub fn parse_if_expr(&mut self, attrs: ThinVec<Attribute>,
in_else: bool) -> PResult<'a, P<Expr>> {
pub fn parse_if_expr(&mut self, attrs: ThinVec<Attribute>) -> PResult<'a, P<Expr>> {
if self.check_keyword(keywords::Let) {
return self.parse_if_let_expr(attrs);
}
let lo = self.prev_span;
let cond = self.parse_expr_res(RESTRICTION_NO_STRUCT_LITERAL, None)?;
let thn = self.parse_block().map_err(|mut err| {
if in_else {
err.cancel();
let sp = lo.next_point();
let mut err = self.diagnostic()
.struct_span_err(sp, "missing condition for `if` statemement");
err.span_label(sp, "expected if condition here");
err
} else {
err
}
})?;
if self.eat_keyword(keywords::Else) {
let sp = lo.next_point();
let mut err = self.diagnostic()
.struct_span_err(sp, "missing condition for `if` statemement");
err.span_label(sp, "expected if condition here");
return Err(err)
}
let thn = self.parse_block()?;
let mut els: Option<P<Expr>> = None;
let mut hi = thn.span;
if self.eat_keyword(keywords::Else) {
@ -3037,7 +3032,7 @@ impl<'a> Parser<'a> {
// `else` token already eaten
pub fn parse_else_expr(&mut self) -> PResult<'a, P<Expr>> {
if self.eat_keyword(keywords::If) {
return self.parse_if_expr(ThinVec::new(), true);
return self.parse_if_expr(ThinVec::new());
} else {
let blk = self.parse_block()?;
return Ok(self.mk_expr(blk.span, ExprKind::Block(blk), ThinVec::new()));