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Update regionck to discharge the binder safely (using

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`assert_no_late_bound_regions`) and to give more helpful debug output.
This commit is contained in:
Niko Matsakis 2015-01-08 09:13:40 -05:00
parent 92425496e5
commit 9b5fb6091a
1 changed files with 28 additions and 10 deletions
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36
src/librustc_typeck/check/regionck.rs
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@ -936,29 +936,47 @@ fn constrain_call<'a, I: Iterator<Item=&'a ast::Expr>>(rcx: &mut Rcx,
fn constrain_autoderefs<'a, 'tcx>(rcx: &mut Rcx<'a, 'tcx>,
deref_expr: &ast::Expr,
derefs: uint,
mut derefd_ty: Ty<'tcx>) {
mut derefd_ty: Ty<'tcx>)
{
debug!("constrain_autoderefs(deref_expr={}, derefs={}, derefd_ty={})",
deref_expr.repr(rcx.tcx()),
derefs,
derefd_ty.repr(rcx.tcx()));
let r_deref_expr = ty::ReScope(CodeExtent::from_node_id(deref_expr.id));
for i in range(0u, derefs) {
debug!("constrain_autoderefs(deref_expr=?, derefd_ty={}, derefs={}/{}",
rcx.fcx.infcx().ty_to_string(derefd_ty),
i, derefs);
let method_call = MethodCall::autoderef(deref_expr.id, i);
debug!("constrain_autoderefs: method_call={:?} (of {:?} total)", method_call, derefs);
derefd_ty = match rcx.fcx.inh.method_map.borrow().get(&method_call) {
Some(method) => {
debug!("constrain_autoderefs: #{} is overloaded, method={}",
i, method.repr(rcx.tcx()));
// Treat overloaded autoderefs as if an AutoRef adjustment
// was applied on the base type, as that is always the case.
let fn_sig = ty::ty_fn_sig(method.ty);
let self_ty = fn_sig.0.inputs[0];
let fn_sig = // late-bound regions should have been instantiated
ty::assert_no_late_bound_regions(rcx.tcx(), fn_sig);
let self_ty = fn_sig.inputs[0];
let (m, r) = match self_ty.sty {
ty::ty_rptr(r, ref m) => (m.mutbl, r),
_ => rcx.tcx().sess.span_bug(deref_expr.span,
_ => {
rcx.tcx().sess.span_bug(
deref_expr.span,
&format!("bad overloaded deref type {}",
method.ty.repr(rcx.tcx()))[])
}
};
debug!("constrain_autoderefs: receiver r={:?} m={:?}",
r.repr(rcx.tcx()), m);
{
let mc = mc::MemCategorizationContext::new(rcx.fcx);
let self_cmt = ignore_err!(mc.cat_expr_autoderefd(deref_expr, i));
debug!("constrain_autoderefs: self_cmt={:?}",
self_cmt.repr(rcx.tcx()));
link_region(rcx, deref_expr.span, *r,
ty::BorrowKind::from_mutbl(m), self_cmt);
}
@ -966,7 +984,7 @@ fn constrain_autoderefs<'a, 'tcx>(rcx: &mut Rcx<'a, 'tcx>,
// Specialized version of constrain_call.
type_must_outlive(rcx, infer::CallRcvr(deref_expr.span),
self_ty, r_deref_expr);
match fn_sig.0.output {
match fn_sig.output {
ty::FnConverging(return_type) => {
type_must_outlive(rcx, infer::CallReturn(deref_expr.span),
return_type, r_deref_expr);
@ -1185,7 +1203,7 @@ fn link_region_from_node_type<'a, 'tcx>(rcx: &Rcx<'a, 'tcx>,
id: ast::NodeId,
mutbl: ast::Mutability,
cmt_borrowed: mc::cmt<'tcx>) {
debug!("link_region_from_node_type(id={}, mutbl={}, cmt_borrowed={})",
debug!("link_region_from_node_type(id={:?}, mutbl={:?}, cmt_borrowed={})",
id, mutbl, cmt_borrowed.repr(rcx.tcx()));
let rptr_ty = rcx.resolve_node_type(id);