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coherence: move the builtin trait checks to their own module

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no functional changes
This commit is contained in:
Ariel Ben-Yehuda 2016-12-04 00:28:30 +02:00
parent 8f62c29200
commit f8a2f9838d
2 changed files with 361 additions and 352 deletions
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357
src/librustc_typeck/coherence/builtin.rs Normal file
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@ -0,0 +1,357 @@
// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! Check properties that are required by built-in traits and set
//! up data structures required by type-checking/translation.
use rustc::middle::free_region::FreeRegionMap;
use rustc::middle::lang_items::UnsizeTraitLangItem;
use rustc::traits::{self, ObligationCause, Reveal};
use rustc::ty::{self, Ty, TyCtxt};
use rustc::ty::ParameterEnvironment;
use rustc::ty::TypeFoldable;
use rustc::ty::subst::Subst;
use rustc::ty::util::CopyImplementationError;
use rustc::infer;
use rustc::hir::map as hir_map;
use rustc::hir::{self, ItemImpl};
pub fn check<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
populate_destructors(tcx);
check_implementations_of_copy(tcx);
check_implementations_of_coerce_unsized(tcx);
}
fn populate_destructors<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
let drop_trait = match tcx.lang_items.drop_trait() {
Some(id) => id,
None => return,
};
tcx.populate_implementations_for_trait_if_necessary(drop_trait);
let drop_trait = tcx.lookup_trait_def(drop_trait);
drop_trait.for_each_impl(tcx, |impl_did| {
let items = tcx.associated_item_def_ids(impl_did);
if items.is_empty() {
// We'll error out later. For now, just don't ICE.
return;
}
let method_def_id = items[0];
let self_type = tcx.item_type(impl_did);
match self_type.sty {
ty::TyAdt(type_def, _) => {
type_def.set_destructor(method_def_id);
}
_ => {
// Destructors only work on nominal types.
if let Some(impl_node_id) = tcx.map.as_local_node_id(impl_did) {
match tcx.map.find(impl_node_id) {
Some(hir_map::NodeItem(item)) => {
let span = match item.node {
ItemImpl(.., ref ty, _) => ty.span,
_ => item.span,
};
struct_span_err!(tcx.sess,
span,
E0120,
"the Drop trait may only be implemented on \
structures")
.span_label(span,
&format!("implementing Drop requires a struct"))
.emit();
}
_ => {
bug!("didn't find impl in ast map");
}
}
} else {
bug!("found external impl of Drop trait on \
something other than a struct");
}
}
}
});
}
fn check_implementations_of_copy<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
let copy_trait = match tcx.lang_items.copy_trait() {
Some(id) => id,
None => return,
};
tcx.populate_implementations_for_trait_if_necessary(copy_trait);
let copy_trait = tcx.lookup_trait_def(copy_trait);
copy_trait.for_each_impl(tcx, |impl_did| {
debug!("check_implementations_of_copy: impl_did={:?}", impl_did);
let impl_node_id = if let Some(n) = tcx.map.as_local_node_id(impl_did) {
n
} else {
debug!("check_implementations_of_copy(): impl not in this \
crate");
return;
};
let self_type = tcx.item_type(impl_did);
debug!("check_implementations_of_copy: self_type={:?} (bound)",
self_type);
let span = tcx.map.span(impl_node_id);
let param_env = ParameterEnvironment::for_item(tcx, impl_node_id);
let self_type = self_type.subst(tcx, &param_env.free_substs);
assert!(!self_type.has_escaping_regions());
debug!("check_implementations_of_copy: self_type={:?} (free)",
self_type);
match param_env.can_type_implement_copy(tcx, self_type, span) {
Ok(()) => {}
Err(CopyImplementationError::InfrigingField(name)) => {
struct_span_err!(tcx.sess,
span,
E0204,
"the trait `Copy` may not be implemented for this type")
.span_label(span, &format!("field `{}` does not implement `Copy`", name))
.emit()
}
Err(CopyImplementationError::InfrigingVariant(name)) => {
let item = tcx.map.expect_item(impl_node_id);
let span = if let ItemImpl(.., Some(ref tr), _, _) = item.node {
tr.path.span
} else {
span
};
struct_span_err!(tcx.sess,
span,
E0205,
"the trait `Copy` may not be implemented for this type")
.span_label(span,
&format!("variant `{}` does not implement `Copy`", name))
.emit()
}
Err(CopyImplementationError::NotAnAdt) => {
let item = tcx.map.expect_item(impl_node_id);
let span = if let ItemImpl(.., ref ty, _) = item.node {
ty.span
} else {
span
};
struct_span_err!(tcx.sess,
span,
E0206,
"the trait `Copy` may not be implemented for this type")
.span_label(span, &format!("type is not a structure or enumeration"))
.emit();
}
Err(CopyImplementationError::HasDestructor) => {
struct_span_err!(tcx.sess,
span,
E0184,
"the trait `Copy` may not be implemented for this type; the \
type has a destructor")
.span_label(span, &format!("Copy not allowed on types with destructors"))
.emit();
}
}
});
}
fn check_implementations_of_coerce_unsized<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
let coerce_unsized_trait = match tcx.lang_items.coerce_unsized_trait() {
Some(id) => id,
None => return,
};
let unsize_trait = match tcx.lang_items.require(UnsizeTraitLangItem) {
Ok(id) => id,
Err(err) => {
tcx.sess.fatal(&format!("`CoerceUnsized` implementation {}", err));
}
};
let trait_def = tcx.lookup_trait_def(coerce_unsized_trait);
trait_def.for_each_impl(tcx, |impl_did| {
debug!("check_implementations_of_coerce_unsized: impl_did={:?}",
impl_did);
let impl_node_id = if let Some(n) = tcx.map.as_local_node_id(impl_did) {
n
} else {
debug!("check_implementations_of_coerce_unsized(): impl not \
in this crate");
return;
};
let source = tcx.item_type(impl_did);
let trait_ref = tcx.impl_trait_ref(impl_did).unwrap();
let target = trait_ref.substs.type_at(1);
debug!("check_implementations_of_coerce_unsized: {:?} -> {:?} (bound)",
source,
target);
let span = tcx.map.span(impl_node_id);
let param_env = ParameterEnvironment::for_item(tcx, impl_node_id);
let source = source.subst(tcx, &param_env.free_substs);
let target = target.subst(tcx, &param_env.free_substs);
assert!(!source.has_escaping_regions());
debug!("check_implementations_of_coerce_unsized: {:?} -> {:?} (free)",
source,
target);
tcx.infer_ctxt(None, Some(param_env), Reveal::ExactMatch).enter(|infcx| {
let cause = ObligationCause::misc(span, impl_node_id);
let check_mutbl = |mt_a: ty::TypeAndMut<'tcx>,
mt_b: ty::TypeAndMut<'tcx>,
mk_ptr: &Fn(Ty<'tcx>) -> Ty<'tcx>| {
if (mt_a.mutbl, mt_b.mutbl) == (hir::MutImmutable, hir::MutMutable) {
infcx.report_mismatched_types(&cause,
mk_ptr(mt_b.ty),
target,
ty::error::TypeError::Mutability)
.emit();
}
(mt_a.ty, mt_b.ty, unsize_trait, None)
};
let (source, target, trait_def_id, kind) = match (&source.sty, &target.sty) {
(&ty::TyBox(a), &ty::TyBox(b)) => (a, b, unsize_trait, None),
(&ty::TyRef(r_a, mt_a), &ty::TyRef(r_b, mt_b)) => {
infcx.sub_regions(infer::RelateObjectBound(span), r_b, r_a);
check_mutbl(mt_a, mt_b, &|ty| tcx.mk_imm_ref(r_b, ty))
}
(&ty::TyRef(_, mt_a), &ty::TyRawPtr(mt_b)) |
(&ty::TyRawPtr(mt_a), &ty::TyRawPtr(mt_b)) => {
check_mutbl(mt_a, mt_b, &|ty| tcx.mk_imm_ptr(ty))
}
(&ty::TyAdt(def_a, substs_a), &ty::TyAdt(def_b, substs_b))
if def_a.is_struct() && def_b.is_struct() => {
if def_a != def_b {
let source_path = tcx.item_path_str(def_a.did);
let target_path = tcx.item_path_str(def_b.did);
span_err!(tcx.sess,
span,
E0377,
"the trait `CoerceUnsized` may only be implemented \
for a coercion between structures with the same \
definition; expected {}, found {}",
source_path,
target_path);
return;
}
let fields = &def_a.struct_variant().fields;
let diff_fields = fields.iter()
.enumerate()
.filter_map(|(i, f)| {
let (a, b) = (f.ty(tcx, substs_a), f.ty(tcx, substs_b));
if tcx.item_type(f.did).is_phantom_data() {
// Ignore PhantomData fields
return None;
}
// Ignore fields that aren't significantly changed
if let Ok(ok) = infcx.sub_types(false, &cause, b, a) {
if ok.obligations.is_empty() {
return None;
}
}
// Collect up all fields that were significantly changed
// i.e. those that contain T in coerce_unsized T -> U
Some((i, a, b))
})
.collect::<Vec<_>>();
if diff_fields.is_empty() {
span_err!(tcx.sess,
span,
E0374,
"the trait `CoerceUnsized` may only be implemented \
for a coercion between structures with one field \
being coerced, none found");
return;
} else if diff_fields.len() > 1 {
let item = tcx.map.expect_item(impl_node_id);
let span = if let ItemImpl(.., Some(ref t), _, _) = item.node {
t.path.span
} else {
tcx.map.span(impl_node_id)
};
let mut err = struct_span_err!(tcx.sess,
span,
E0375,
"implementing the trait \
`CoerceUnsized` requires multiple \
coercions");
err.note("`CoerceUnsized` may only be implemented for \
a coercion between structures with one field being coerced");
err.note(&format!("currently, {} fields need coercions: {}",
diff_fields.len(),
diff_fields.iter()
.map(|&(i, a, b)| {
format!("{} ({} to {})", fields[i].name, a, b)
})
.collect::<Vec<_>>()
.join(", ")));
err.span_label(span, &format!("requires multiple coercions"));
err.emit();
return;
}
let (i, a, b) = diff_fields[0];
let kind = ty::adjustment::CustomCoerceUnsized::Struct(i);
(a, b, coerce_unsized_trait, Some(kind))
}
_ => {
span_err!(tcx.sess,
span,
E0376,
"the trait `CoerceUnsized` may only be implemented \
for a coercion between structures");
return;
}
};
let mut fulfill_cx = traits::FulfillmentContext::new();
// Register an obligation for `A: Trait<B>`.
let cause = traits::ObligationCause::misc(span, impl_node_id);
let predicate =
tcx.predicate_for_trait_def(cause, trait_def_id, 0, source, &[target]);
fulfill_cx.register_predicate_obligation(&infcx, predicate);
// Check that all transitive obligations are satisfied.
if let Err(errors) = fulfill_cx.select_all_or_error(&infcx) {
infcx.report_fulfillment_errors(&errors);
}
// Finally, resolve all regions.
let mut free_regions = FreeRegionMap::new();
free_regions.relate_free_regions_from_predicates(&infcx.parameter_environment
.caller_bounds);
infcx.resolve_regions_and_report_errors(&free_regions, impl_node_id);
if let Some(kind) = kind {
tcx.custom_coerce_unsized_kinds.borrow_mut().insert(impl_did, kind);
}
});
});
}

356
src/librustc_typeck/coherence/mod.rs
View File

@ -16,28 +16,23 @@
// mappings. That mapping code resides here.
use hir::def_id::DefId;
use middle::lang_items::UnsizeTraitLangItem;
use rustc::ty::subst::Subst;
use rustc::traits::Reveal;
use rustc::ty::{self, TyCtxt, TypeFoldable};
use rustc::traits::{self, ObligationCause, Reveal};
use rustc::ty::ParameterEnvironment;
use rustc::ty::{Ty, TyBool, TyChar, TyError};
use rustc::ty::{TyParam, TyRawPtr};
use rustc::ty::{TyRef, TyAdt, TyDynamic, TyNever, TyTuple};
use rustc::ty::{TyStr, TyArray, TySlice, TyFloat, TyInfer, TyInt};
use rustc::ty::{TyUint, TyClosure, TyBox, TyFnDef, TyFnPtr};
use rustc::ty::{TyProjection, TyAnon};
use rustc::ty::util::CopyImplementationError;
use middle::free_region::FreeRegionMap;
use CrateCtxt;
use rustc::infer::{self, InferCtxt};
use rustc::infer::{InferCtxt};
use syntax_pos::Span;
use rustc::dep_graph::DepNode;
use rustc::hir::map as hir_map;
use rustc::hir::itemlikevisit::ItemLikeVisitor;
use rustc::hir::{Item, ItemImpl};
use rustc::hir;
mod builtin;
mod orphan;
mod overlap;
mod unsafety;
@ -96,18 +91,7 @@ fn check(&self) {
self.crate_context.tcx.visit_all_item_likes_in_krate(
DepNode::CoherenceCheckImpl,
&mut CoherenceCheckVisitor { cc: self });
// Populate the table of destructors. It might seem a bit strange to
// do this here, but it's actually the most convenient place, since
// the coherence tables contain the trait -> type mappings.
self.populate_destructors();
// Check to make sure implementations of `Copy` are legal.
self.check_implementations_of_copy();
// Check to make sure implementations of `CoerceUnsized` are legal
// and collect the necessary information from them.
self.check_implementations_of_coerce_unsized();
builtin::check(self.crate_context.tcx);
}
fn check_implementation(&self, item: &Item) {
@ -161,338 +145,6 @@ fn add_trait_impl(&self, impl_trait_ref: ty::TraitRef<'gcx>, impl_def_id: DefId)
let trait_def = self.crate_context.tcx.lookup_trait_def(impl_trait_ref.def_id);
trait_def.record_local_impl(self.crate_context.tcx, impl_def_id, impl_trait_ref);
}
// Destructors
//
fn populate_destructors(&self) {
let tcx = self.crate_context.tcx;
let drop_trait = match tcx.lang_items.drop_trait() {
Some(id) => id,
None => return,
};
tcx.populate_implementations_for_trait_if_necessary(drop_trait);
let drop_trait = tcx.lookup_trait_def(drop_trait);
drop_trait.for_each_impl(tcx, |impl_did| {
let items = tcx.associated_item_def_ids(impl_did);
if items.is_empty() {
// We'll error out later. For now, just don't ICE.
return;
}
let method_def_id = items[0];
let self_type = tcx.item_type(impl_did);
match self_type.sty {
ty::TyAdt(type_def, _) => {
type_def.set_destructor(method_def_id);
}
_ => {
// Destructors only work on nominal types.
if let Some(impl_node_id) = tcx.map.as_local_node_id(impl_did) {
match tcx.map.find(impl_node_id) {
Some(hir_map::NodeItem(item)) => {
let span = match item.node {
ItemImpl(.., ref ty, _) => ty.span,
_ => item.span,
};
struct_span_err!(tcx.sess,
span,
E0120,
"the Drop trait may only be implemented on \
structures")
.span_label(span,
&format!("implementing Drop requires a struct"))
.emit();
}
_ => {
bug!("didn't find impl in ast map");
}
}
} else {
bug!("found external impl of Drop trait on \
something other than a struct");
}
}
}
});
}
/// Ensures that implementations of the built-in trait `Copy` are legal.
fn check_implementations_of_copy(&self) {
let tcx = self.crate_context.tcx;
let copy_trait = match tcx.lang_items.copy_trait() {
Some(id) => id,
None => return,
};
tcx.populate_implementations_for_trait_if_necessary(copy_trait);
let copy_trait = tcx.lookup_trait_def(copy_trait);
copy_trait.for_each_impl(tcx, |impl_did| {
debug!("check_implementations_of_copy: impl_did={:?}", impl_did);
let impl_node_id = if let Some(n) = tcx.map.as_local_node_id(impl_did) {
n
} else {
debug!("check_implementations_of_copy(): impl not in this \
crate");
return;
};
let self_type = tcx.item_type(impl_did);
debug!("check_implementations_of_copy: self_type={:?} (bound)",
self_type);
let span = tcx.map.span(impl_node_id);
let param_env = ParameterEnvironment::for_item(tcx, impl_node_id);
let self_type = self_type.subst(tcx, &param_env.free_substs);
assert!(!self_type.has_escaping_regions());
debug!("check_implementations_of_copy: self_type={:?} (free)",
self_type);
match param_env.can_type_implement_copy(tcx, self_type, span) {
Ok(()) => {}
Err(CopyImplementationError::InfrigingField(name)) => {
struct_span_err!(tcx.sess,
span,
E0204,
"the trait `Copy` may not be implemented for this type")
.span_label(span, &format!("field `{}` does not implement `Copy`", name))
.emit()
}
Err(CopyImplementationError::InfrigingVariant(name)) => {
let item = tcx.map.expect_item(impl_node_id);
let span = if let ItemImpl(.., Some(ref tr), _, _) = item.node {
tr.path.span
} else {
span
};
struct_span_err!(tcx.sess,
span,
E0205,
"the trait `Copy` may not be implemented for this type")
.span_label(span,
&format!("variant `{}` does not implement `Copy`", name))
.emit()
}
Err(CopyImplementationError::NotAnAdt) => {
let item = tcx.map.expect_item(impl_node_id);
let span = if let ItemImpl(.., ref ty, _) = item.node {
ty.span
} else {
span
};
struct_span_err!(tcx.sess,
span,
E0206,
"the trait `Copy` may not be implemented for this type")
.span_label(span, &format!("type is not a structure or enumeration"))
.emit();
}
Err(CopyImplementationError::HasDestructor) => {
struct_span_err!(tcx.sess,
span,
E0184,
"the trait `Copy` may not be implemented for this type; the \
type has a destructor")
.span_label(span, &format!("Copy not allowed on types with destructors"))
.emit();
}
}
});
}
/// Process implementations of the built-in trait `CoerceUnsized`.
fn check_implementations_of_coerce_unsized(&self) {
let tcx = self.crate_context.tcx;
let coerce_unsized_trait = match tcx.lang_items.coerce_unsized_trait() {
Some(id) => id,
None => return,
};
let unsize_trait = match tcx.lang_items.require(UnsizeTraitLangItem) {
Ok(id) => id,
Err(err) => {
tcx.sess.fatal(&format!("`CoerceUnsized` implementation {}", err));
}
};
let trait_def = tcx.lookup_trait_def(coerce_unsized_trait);
trait_def.for_each_impl(tcx, |impl_did| {
debug!("check_implementations_of_coerce_unsized: impl_did={:?}",
impl_did);
let impl_node_id = if let Some(n) = tcx.map.as_local_node_id(impl_did) {
n
} else {
debug!("check_implementations_of_coerce_unsized(): impl not \
in this crate");
return;
};
let source = tcx.item_type(impl_did);
let trait_ref = self.crate_context.tcx.impl_trait_ref(impl_did).unwrap();
let target = trait_ref.substs.type_at(1);
debug!("check_implementations_of_coerce_unsized: {:?} -> {:?} (bound)",
source,
target);
let span = tcx.map.span(impl_node_id);
let param_env = ParameterEnvironment::for_item(tcx, impl_node_id);
let source = source.subst(tcx, &param_env.free_substs);
let target = target.subst(tcx, &param_env.free_substs);
assert!(!source.has_escaping_regions());
debug!("check_implementations_of_coerce_unsized: {:?} -> {:?} (free)",
source,
target);
tcx.infer_ctxt(None, Some(param_env), Reveal::ExactMatch).enter(|infcx| {
let cause = ObligationCause::misc(span, impl_node_id);
let check_mutbl = |mt_a: ty::TypeAndMut<'gcx>,
mt_b: ty::TypeAndMut<'gcx>,
mk_ptr: &Fn(Ty<'gcx>) -> Ty<'gcx>| {
if (mt_a.mutbl, mt_b.mutbl) == (hir::MutImmutable, hir::MutMutable) {
infcx.report_mismatched_types(&cause,
mk_ptr(mt_b.ty),
target,
ty::error::TypeError::Mutability).emit();
}
(mt_a.ty, mt_b.ty, unsize_trait, None)
};
let (source, target, trait_def_id, kind) = match (&source.sty, &target.sty) {
(&ty::TyBox(a), &ty::TyBox(b)) => (a, b, unsize_trait, None),
(&ty::TyRef(r_a, mt_a), &ty::TyRef(r_b, mt_b)) => {
infcx.sub_regions(infer::RelateObjectBound(span), r_b, r_a);
check_mutbl(mt_a, mt_b, &|ty| tcx.mk_imm_ref(r_b, ty))
}
(&ty::TyRef(_, mt_a), &ty::TyRawPtr(mt_b)) |
(&ty::TyRawPtr(mt_a), &ty::TyRawPtr(mt_b)) => {
check_mutbl(mt_a, mt_b, &|ty| tcx.mk_imm_ptr(ty))
}
(&ty::TyAdt(def_a, substs_a), &ty::TyAdt(def_b, substs_b))
if def_a.is_struct() && def_b.is_struct() => {
if def_a != def_b {
let source_path = tcx.item_path_str(def_a.did);
let target_path = tcx.item_path_str(def_b.did);
span_err!(tcx.sess,
span,
E0377,
"the trait `CoerceUnsized` may only be implemented \
for a coercion between structures with the same \
definition; expected {}, found {}",
source_path,
target_path);
return;
}
let fields = &def_a.struct_variant().fields;
let diff_fields = fields.iter()
.enumerate()
.filter_map(|(i, f)| {
let (a, b) = (f.ty(tcx, substs_a), f.ty(tcx, substs_b));
if tcx.item_type(f.did).is_phantom_data() {
// Ignore PhantomData fields
return None;
}
// Ignore fields that aren't significantly changed
if let Ok(ok) = infcx.sub_types(false, &cause, b, a) {
if ok.obligations.is_empty() {
return None;
}
}
// Collect up all fields that were significantly changed
// i.e. those that contain T in coerce_unsized T -> U
Some((i, a, b))
})
.collect::<Vec<_>>();
if diff_fields.is_empty() {
span_err!(tcx.sess,
span,
E0374,
"the trait `CoerceUnsized` may only be implemented \
for a coercion between structures with one field \
being coerced, none found");
return;
} else if diff_fields.len() > 1 {
let item = tcx.map.expect_item(impl_node_id);
let span = if let ItemImpl(.., Some(ref t), _, _) = item.node {
t.path.span
} else {
tcx.map.span(impl_node_id)
};
let mut err = struct_span_err!(tcx.sess,
span,
E0375,
"implementing the trait \
`CoerceUnsized` requires multiple \
coercions");
err.note("`CoerceUnsized` may only be implemented for \
a coercion between structures with one field being coerced");
err.note(&format!("currently, {} fields need coercions: {}",
diff_fields.len(),
diff_fields.iter()
.map(|&(i, a, b)| {
format!("{} ({} to {})", fields[i].name, a, b)
})
.collect::<Vec<_>>()
.join(", ")));
err.span_label(span, &format!("requires multiple coercions"));
err.emit();
return;
}
let (i, a, b) = diff_fields[0];
let kind = ty::adjustment::CustomCoerceUnsized::Struct(i);
(a, b, coerce_unsized_trait, Some(kind))
}
_ => {
span_err!(tcx.sess,
span,
E0376,
"the trait `CoerceUnsized` may only be implemented \
for a coercion between structures");
return;
}
};
let mut fulfill_cx = traits::FulfillmentContext::new();
// Register an obligation for `A: Trait<B>`.
let cause = traits::ObligationCause::misc(span, impl_node_id);
let predicate =
tcx.predicate_for_trait_def(cause, trait_def_id, 0, source, &[target]);
fulfill_cx.register_predicate_obligation(&infcx, predicate);
// Check that all transitive obligations are satisfied.
if let Err(errors) = fulfill_cx.select_all_or_error(&infcx) {
infcx.report_fulfillment_errors(&errors);
}
// Finally, resolve all regions.
let mut free_regions = FreeRegionMap::new();
free_regions.relate_free_regions_from_predicates(&infcx.parameter_environment
.caller_bounds);
infcx.resolve_regions_and_report_errors(&free_regions, impl_node_id);
if let Some(kind) = kind {
tcx.custom_coerce_unsized_kinds.borrow_mut().insert(impl_did, kind);
}
});
});
}
}
fn enforce_trait_manually_implementable(tcx: TyCtxt, sp: Span, trait_def_id: DefId) {