bjoernager/rust
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Produce a better error for irrefutable if let patterns

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Modify ast::ExprMatch to include a new value of type ast::MatchSource,
making it easy to tell whether the match was written literally or
produced via desugaring. This allows us to customize error messages
appropriately.
This commit is contained in:
Kevin Ballard 2014-08-25 14:55:00 -07:00 • committed by Jakub Wieczorek
parent 1bc407fb84
commit 976438f78f
20 changed files with 115 additions and 23 deletions
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4
src/libsyntax/parse/parser.rs
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@ -38,7 +38,7 @@ use ast::{ItemMac, ItemMod, ItemStruct, ItemTrait, ItemTy};
use ast::{LifetimeDef, Lit, Lit_};
use ast::{LitBool, LitChar, LitByte, LitBinary};
use ast::{LitNil, LitStr, LitInt, Local, LocalLet};
use ast::{MutImmutable, MutMutable, Mac_, MacInvocTT, Matcher, MatchNonterminal};
use ast::{MutImmutable, MutMutable, Mac_, MacInvocTT, Matcher, MatchNonterminal, MatchNormal};
use ast::{MatchSeq, MatchTok, Method, MutTy, BiMul, Mutability};
use ast::{MethodImplItem, NamedField, UnNeg, NoReturn, UnNot};
use ast::{Pat, PatEnum, PatIdent, PatLit, PatRange, PatRegion, PatStruct};
@ -2973,7 +2973,7 @@ impl<'a> Parser<'a> {
}
let hi = self.span.hi;
self.bump();
return self.mk_expr(lo, hi, ExprMatch(discriminant, arms));
return self.mk_expr(lo, hi, ExprMatch(discriminant, arms, MatchNormal));
}
pub fn parse_arm(&mut self) -> Arm {