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simplify some code

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This commit is contained in:
Oliver 'ker' Schneider 2016-01-16 14:29:20 +01:00
parent 8e12365570
commit 1aacd9d44f
1 changed files with 6 additions and 20 deletions
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26
src/librustc/middle/const_eval.rs
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@ -44,20 +44,6 @@ use std::mem::transmute;
use std::{i8, i16, i32, i64, u8, u16, u32, u64};
use std::rc::Rc;
fn lookup_const<'a>(tcx: &'a ty::ctxt, e: &Expr) -> Option<&'a Expr> {
let opt_def = tcx.def_map.borrow().get(&e.id).map(|d| d.full_def());
match opt_def {
Some(def::DefConst(def_id)) |
Some(def::DefAssociatedConst(def_id)) => {
lookup_const_by_id(tcx, def_id, Some(e.id), None)
}
Some(def::DefVariant(enum_def, variant_def, _)) => {
lookup_variant_by_id(tcx, enum_def, variant_def)
}
_ => None
}
}
fn lookup_variant_by_id<'a>(tcx: &'a ty::ctxt,
enum_def: DefId,
variant_def: DefId)
@ -382,12 +368,12 @@ pub fn const_expr_to_pat(tcx: &ty::ctxt, expr: &Expr, span: Span) -> P<hir::Pat>
hir::PatStruct(path.clone(), hir::HirVec::new(), false),
Some(def::DefVariant(..)) =>
hir::PatEnum(path.clone(), None),
_ => {
match lookup_const(tcx, expr) {
Some(actual) => return const_expr_to_pat(tcx, actual, span),
_ => unreachable!()
}
}
Some(def::DefConst(def_id)) |
Some(def::DefAssociatedConst(def_id)) => {
let expr = lookup_const_by_id(tcx, def_id, Some(expr.id), None).unwrap();
return const_expr_to_pat(tcx, expr, span);
},
_ => unreachable!(),
}
}