nordic-dev.net/rust
nordic-dev.net/rust
2
0
Fork 0
mirror of https://github.com/rust-lang/rust.git synced 2024-11-23 23:34:48 +00:00
Code Issues Packages Projects Releases Wiki Activity

Auto merge of #40806 - frewsxcv:rollup, r=frewsxcv

Browse Source 
Rollup of 8 pull requests

- Successful merges: #40567, #40602, #40636, #40739, #40756, #40790, #40794, #40803
- Failed merges:
This commit is contained in:
bors 2017-03-24 23:46:45 +00:00
commit 49c67bd632
22 changed files with 188 additions and 122 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
CONTRIBUTING.md
View File

@ -311,9 +311,13 @@ To save @bors some work, and to get small changes through more quickly, when
the other rollup-eligible patches too, and they'll get tested and merged at
the same time.
To find documentation-related issues, sort by the [A-docs label][adocs].
To find documentation-related issues, sort by the [T-doc label][tdoc].
[adocs]: https://github.com/rust-lang/rust/issues?q=is%3Aopen+is%3Aissue+label%3AA-docs
[tdoc]: https://github.com/rust-lang/rust/issues?q=is%3Aopen%20is%3Aissue%20label%3AT-doc
You can find documentation style guidelines in [RFC 1574][rfc1574].
[rfc1574]: https://github.com/rust-lang/rfcs/blob/master/text/1574-more-api-documentation-conventions.md#appendix-a-full-conventions-text
In many cases, you don't need a full `./x.py doc`. You can use `rustdoc` directly
to check small fixes. For example, `rustdoc src/doc/reference.md` will render

3
src/libcollections/btree/map.rs
View File

@ -141,8 +141,7 @@ pub struct BTreeMap<K, V> {
unsafe impl<#[may_dangle] K, #[may_dangle] V> Drop for BTreeMap<K, V> {
fn drop(&mut self) {
unsafe {
for _ in ptr::read(self).into_iter() {
}
drop(ptr::read(self).into_iter());
}
}
}

6
src/libcollections/slice.rs
View File

@ -1162,7 +1162,7 @@ impl<T> [T] {
///
/// # Current implementation
///
/// The current algorithm is based on Orson Peters' [pdqsort][pattern-defeating quicksort],
/// The current algorithm is based on Orson Peters' [pattern-defeating quicksort][pdqsort],
/// which is a quicksort variant designed to be very fast on certain kinds of patterns,
/// sometimes achieving linear time. It is randomized but deterministic, and falls back to
/// heapsort on degenerate inputs.
@ -1199,7 +1199,7 @@ impl<T> [T] {
///
/// # Current implementation
///
/// The current algorithm is based on Orson Peters' [pdqsort][pattern-defeating quicksort],
/// The current algorithm is based on Orson Peters' [pattern-defeating quicksort][pdqsort],
/// which is a quicksort variant designed to be very fast on certain kinds of patterns,
/// sometimes achieving linear time. It is randomized but deterministic, and falls back to
/// heapsort on degenerate inputs.
@ -1239,7 +1239,7 @@ impl<T> [T] {
///
/// # Current implementation
///
/// The current algorithm is based on Orson Peters' [pdqsort][pattern-defeating quicksort],
/// The current algorithm is based on Orson Peters' [pattern-defeating quicksort][pdqsort],
/// which is a quicksort variant designed to be very fast on certain kinds of patterns,
/// sometimes achieving linear time. It is randomized but deterministic, and falls back to
/// heapsort on degenerate inputs.

14
src/librustc/mir/mod.rs
View File

@ -983,16 +983,16 @@ impl<'tcx> Debug for Operand<'tcx> {
}
impl<'tcx> Operand<'tcx> {
pub fn item<'a>(tcx: ty::TyCtxt<'a, 'tcx, 'tcx>,
def_id: DefId,
substs: &'tcx Substs<'tcx>,
span: Span)
-> Self
{
pub fn function_handle<'a>(
tcx: ty::TyCtxt<'a, 'tcx, 'tcx>,
def_id: DefId,
substs: &'tcx Substs<'tcx>,
span: Span,
) -> Self {
Operand::Constant(Constant {
span: span,
ty: tcx.item_type(def_id).subst(tcx, substs),
literal: Literal::Item { def_id, substs }
literal: Literal::Value { value: ConstVal::Function(def_id, substs) },
})
}

6
src/librustc_mir/build/scope.rs
View File

@ -89,6 +89,7 @@ should go to.
use build::{BlockAnd, BlockAndExtension, Builder, CFG};
use rustc::middle::region::{CodeExtent, CodeExtentData};
use rustc::middle::lang_items;
use rustc::middle::const_val::ConstVal;
use rustc::ty::subst::{Kind, Subst};
use rustc::ty::{Ty, TyCtxt};
use rustc::mir::*;
@ -784,9 +785,8 @@ fn build_free<'a, 'gcx, 'tcx>(tcx: TyCtxt<'a, 'gcx, 'tcx>,
func: Operand::Constant(Constant {
span: data.span,
ty: tcx.item_type(free_func).subst(tcx, substs),
literal: Literal::Item {
def_id: free_func,
substs: substs
literal: Literal::Value {
value: ConstVal::Function(free_func, substs),
}
}),
args: vec![Operand::Consume(data.value.clone())],

33
src/librustc_mir/hair/cx/expr.rs
View File

@ -714,9 +714,8 @@ fn method_callee<'a, 'gcx, 'tcx>(cx: &mut Cx<'a, 'gcx, 'tcx>,
ty: callee.ty,
span: expr.span,
kind: ExprKind::Literal {
literal: Literal::Item {
def_id: callee.def_id,
substs: callee.substs,
literal: Literal::Value {
value: ConstVal::Function(callee.def_id, callee.substs),
},
},
}
@ -743,14 +742,24 @@ fn convert_path_expr<'a, 'gcx, 'tcx>(cx: &mut Cx<'a, 'gcx, 'tcx>,
-> ExprKind<'tcx> {
let substs = cx.tables().node_id_item_substs(expr.id)
.unwrap_or_else(|| cx.tcx.intern_substs(&[]));
let def_id = match def {
match def {
// A regular function, constructor function or a constant.
Def::Fn(def_id) |
Def::Method(def_id) |
Def::StructCtor(def_id, CtorKind::Fn) |
Def::VariantCtor(def_id, CtorKind::Fn) |
Def::VariantCtor(def_id, CtorKind::Fn) => ExprKind::Literal {
literal: Literal::Value {
value: ConstVal::Function(def_id, substs),
},
},
Def::Const(def_id) |
Def::AssociatedConst(def_id) => def_id,
Def::AssociatedConst(def_id) => ExprKind::Literal {
literal: Literal::Item {
def_id: def_id,
substs: substs,
},
},
Def::StructCtor(def_id, CtorKind::Const) |
Def::VariantCtor(def_id, CtorKind::Const) => {
@ -758,7 +767,7 @@ fn convert_path_expr<'a, 'gcx, 'tcx>(cx: &mut Cx<'a, 'gcx, 'tcx>,
// A unit struct/variant which is used as a value.
// We return a completely different ExprKind here to account for this special case.
ty::TyAdt(adt_def, substs) => {
return ExprKind::Adt {
ExprKind::Adt {
adt_def: adt_def,
variant_index: adt_def.variant_index_with_id(def_id),
substs: substs,
@ -770,17 +779,11 @@ fn convert_path_expr<'a, 'gcx, 'tcx>(cx: &mut Cx<'a, 'gcx, 'tcx>,
}
}
Def::Static(node_id, _) => return ExprKind::StaticRef { id: node_id },
Def::Static(node_id, _) => ExprKind::StaticRef { id: node_id },
Def::Local(..) | Def::Upvar(..) => return convert_var(cx, expr, def),
Def::Local(..) | Def::Upvar(..) => convert_var(cx, expr, def),
_ => span_bug!(expr.span, "def `{:?}` not yet implemented", def),
};
ExprKind::Literal {
literal: Literal::Item {
def_id: def_id,
substs: substs,
},
}
}

5
src/librustc_mir/hair/cx/mod.rs
View File

@ -132,9 +132,8 @@ impl<'a, 'gcx, 'tcx> Cx<'a, 'gcx, 'tcx> {
let method_ty = self.tcx.item_type(item.def_id);
let method_ty = method_ty.subst(self.tcx, substs);
return (method_ty,
Literal::Item {
def_id: item.def_id,
substs: substs,
Literal::Value {
value: ConstVal::Function(item.def_id, substs),
});
}
}

5
src/librustc_mir/shim.rs
View File

@ -12,6 +12,7 @@ use rustc::hir;
use rustc::hir::def_id::DefId;
use rustc::infer;
use rustc::middle::region::ROOT_CODE_EXTENT;
use rustc::middle::const_val::ConstVal;
use rustc::mir::*;
use rustc::mir::transform::MirSource;
use rustc::ty::{self, Ty};
@ -335,7 +336,9 @@ fn build_call_shim<'a, 'tcx>(tcx: ty::TyCtxt<'a, 'tcx, 'tcx>,
Operand::Constant(Constant {
span: span,
ty: tcx.item_type(def_id).subst(tcx, param_env.free_substs),
literal: Literal::Item { def_id, substs: param_env.free_substs },
literal: Literal::Value {
value: ConstVal::Function(def_id, param_env.free_substs),
},
}),
vec![rcvr]
)

5
src/librustc_mir/transform/qualify_consts.rs
View File

@ -568,11 +568,6 @@ impl<'a, 'tcx> Visitor<'tcx> for Qualifier<'a, 'tcx, 'tcx> {
});
}
Operand::Constant(ref constant) => {
// Only functions and methods can have these types.
if let ty::TyFnDef(..) = constant.ty.sty {
return;
}
if let Literal::Item { def_id, substs } = constant.literal {
// Don't peek inside generic (associated) constants.
if substs.types().next().is_some() {

5
src/librustc_mir/transform/type_check.rs
View File

@ -15,6 +15,7 @@ use rustc::infer::{self, InferCtxt, InferOk};
use rustc::traits::{self, Reveal};
use rustc::ty::fold::TypeFoldable;
use rustc::ty::{self, Ty, TyCtxt, TypeVariants};
use rustc::middle::const_val::ConstVal;
use rustc::mir::*;
use rustc::mir::tcx::LvalueTy;
use rustc::mir::transform::{MirPass, MirSource, Pass};
@ -526,7 +527,9 @@ impl<'a, 'gcx, 'tcx> TypeChecker<'a, 'gcx, 'tcx> {
fn is_box_free(&self, operand: &Operand<'tcx>) -> bool {
match operand {
&Operand::Constant(Constant {
literal: Literal::Item { def_id, .. }, ..
literal: Literal::Value {
value: ConstVal::Function(def_id, _), ..
}, ..
}) => {
Some(def_id) == self.tcx().lang_items.box_free_fn()
}

6
src/librustc_mir/util/elaborate_drops.rs
View File

@ -525,8 +525,8 @@ impl<'l, 'b, 'tcx, D> DropCtxt<'l, 'b, 'tcx, D>
}],
terminator: Some(Terminator {
kind: TerminatorKind::Call {
func: Operand::item(tcx, drop_fn.def_id, substs,
self.source_info.span),
func: Operand::function_handle(tcx, drop_fn.def_id, substs,
self.source_info.span),
args: vec![Operand::Consume(Lvalue::Local(ref_lvalue))],
destination: Some((unit_temp, succ)),
cleanup: unwind,
@ -629,7 +629,7 @@ impl<'l, 'b, 'tcx, D> DropCtxt<'l, 'b, 'tcx, D>
let substs = tcx.mk_substs(iter::once(Kind::from(ty)));
let call = TerminatorKind::Call {
func: Operand::item(tcx, free_func, substs, self.source_info.span),
func: Operand::function_handle(tcx, free_func, substs, self.source_info.span),
args: vec![Operand::Consume(self.lvalue.clone())],
destination: Some((unit_temp, target)),
cleanup: None

7
src/librustc_trans/mir/analyze.rs
View File

@ -13,7 +13,8 @@
use rustc_data_structures::bitvec::BitVector;
use rustc_data_structures::indexed_vec::{Idx, IndexVec};
use rustc::mir::{self, Location, TerminatorKind};
use rustc::middle::const_val::ConstVal;
use rustc::mir::{self, Location, TerminatorKind, Literal};
use rustc::mir::visit::{Visitor, LvalueContext};
use rustc::mir::traversal;
use common;
@ -109,7 +110,9 @@ impl<'mir, 'a, 'tcx> Visitor<'tcx> for LocalAnalyzer<'mir, 'a, 'tcx> {
match *kind {
mir::TerminatorKind::Call {
func: mir::Operand::Constant(mir::Constant {
literal: mir::Literal::Item { def_id, .. }, ..
literal: Literal::Value {
value: ConstVal::Function(def_id, _), ..
}, ..
}),
ref args, ..
} if Some(def_id) == self.cx.ccx.tcx().lang_items.box_free_fn() => {

21
src/librustc_trans/mir/constant.rs
View File

@ -101,9 +101,12 @@ impl<'tcx> Const<'tcx> {
ConstVal::Str(ref v) => C_str_slice(ccx, v.clone()),
ConstVal::ByteStr(ref v) => consts::addr_of(ccx, C_bytes(ccx, v), 1, "byte_str"),
ConstVal::Struct(_) | ConstVal::Tuple(_) |
ConstVal::Array(..) | ConstVal::Repeat(..) |
ConstVal::Array(..) | ConstVal::Repeat(..) => {
bug!("MIR must not use `{:?}` (aggregates are expanded to MIR rvalues)", cv)
}
ConstVal::Function(..) => {
bug!("MIR must not use `{:?}` (which refers to a local ID)", cv)
let llty = type_of::type_of(ccx, ty);
return Const::new(C_null(llty), ty);
}
ConstVal::Char(c) => C_integral(Type::char(ccx), c as u64, false),
};
@ -476,13 +479,6 @@ impl<'a, 'tcx> MirConstContext<'a, 'tcx> {
let ty = self.monomorphize(&constant.ty);
match constant.literal.clone() {
mir::Literal::Item { def_id, substs } => {
// Shortcut for zero-sized types, including function item
// types, which would not work with MirConstContext.
if common::type_is_zero_size(self.ccx, ty) {
let llty = type_of::type_of(self.ccx, ty);
return Ok(Const::new(C_null(llty), ty));
}
let substs = self.monomorphize(&substs);
MirConstContext::trans_def(self.ccx, def_id, substs, IndexVec::new())
}
@ -924,13 +920,6 @@ impl<'a, 'tcx> MirContext<'a, 'tcx> {
let ty = self.monomorphize(&constant.ty);
let result = match constant.literal.clone() {
mir::Literal::Item { def_id, substs } => {
// Shortcut for zero-sized types, including function item
// types, which would not work with MirConstContext.
if common::type_is_zero_size(bcx.ccx, ty) {
let llty = type_of::type_of(bcx.ccx, ty);
return Const::new(C_null(llty), ty);
}
let substs = self.monomorphize(&substs);
MirConstContext::trans_def(bcx.ccx, def_id, substs, IndexVec::new())
}

11
src/librustc_typeck/check/mod.rs
View File

@ -4099,6 +4099,17 @@ impl<'a, 'gcx, 'tcx> FnCtxt<'a, 'gcx, 'tcx> {
};
if self.diverges.get().always() {
if let ExpectHasType(ety) = expected {
// Avoid forcing a type (only `!` for now) in unreachable code.
// FIXME(aburka) do we need this special case? and should it be is_uninhabited?
if !ety.is_never() {
if let Some(ref e) = blk.expr {
// Coerce the tail expression to the right type.
self.demand_coerce(e, ty, ety);
}
}
}
ty = self.next_diverging_ty_var(TypeVariableOrigin::DivergingBlockExpr(blk.span));
} else if let ExpectHasType(ety) = expected {
if let Some(ref e) = blk.expr {

50
src/librustdoc/html/render.rs
View File

@ -1700,6 +1700,23 @@ fn document_stability(w: &mut fmt::Formatter, cx: &Context, item: &clean::Item)
Ok(())
}
fn name_key(name: &str) -> (&str, u64, usize) {
// find number at end
let split = name.bytes().rposition(|b| b < b'0' || b'9' < b).map_or(0, |s| s + 1);
// count leading zeroes
let after_zeroes =
name[split..].bytes().position(|b| b != b'0').map_or(name.len(), |extra| split + extra);
// sort leading zeroes last
let num_zeroes = after_zeroes - split;
match name[split..].parse() {
Ok(n) => (&name[..split], n, num_zeroes),
Err(_) => (name, 0, num_zeroes),
}
}
fn item_module(w: &mut fmt::Formatter, cx: &Context,
item: &clean::Item, items: &[clean::Item]) -> fmt::Result {
document(w, cx, item)?;
@ -1744,7 +1761,9 @@ fn item_module(w: &mut fmt::Formatter, cx: &Context,
(Some(stability::Stable), Some(stability::Unstable)) => return Ordering::Less,
_ => {}
}
i1.name.cmp(&i2.name)
let lhs = i1.name.as_ref().map_or("", |s| &**s);
let rhs = i2.name.as_ref().map_or("", |s| &**s);
name_key(lhs).cmp(&name_key(rhs))
}
indices.sort_by(|&i1, &i2| cmp(&items[i1], &items[i2], i1, i2));
@ -3198,3 +3217,32 @@ fn test_unique_id() {
reset_ids(true);
test();
}
#[cfg(test)]
#[test]
fn test_name_key() {
assert_eq!(name_key("0"), ("", 0, 1));
assert_eq!(name_key("123"), ("", 123, 0));
assert_eq!(name_key("Fruit"), ("Fruit", 0, 0));
assert_eq!(name_key("Fruit0"), ("Fruit", 0, 1));
assert_eq!(name_key("Fruit0000"), ("Fruit", 0, 4));
assert_eq!(name_key("Fruit01"), ("Fruit", 1, 1));
assert_eq!(name_key("Fruit10"), ("Fruit", 10, 0));
assert_eq!(name_key("Fruit123"), ("Fruit", 123, 0));
}
#[cfg(test)]
#[test]
fn test_name_sorting() {
let names = ["Apple",
"Banana",
"Fruit", "Fruit0", "Fruit00",
"Fruit1", "Fruit01",
"Fruit2", "Fruit02",
"Fruit20",
"Fruit100",
"Pear"];
let mut sorted = names.to_owned();
sorted.sort_by_key(|&s| name_key(s));
assert_eq!(names, sorted);
}

65
src/libstd/collections/hash/table.rs
View File

@ -896,15 +896,23 @@ impl<K, V> RawTable<K, V> {
}
}
/// Returns an iterator that copies out each entry. Used while the table
/// is being dropped.
unsafe fn rev_move_buckets(&mut self) -> RevMoveBuckets<K, V> {
let raw_bucket = self.first_bucket_raw();
RevMoveBuckets {
raw: raw_bucket.offset(self.capacity as isize),
hashes_end: raw_bucket.hash,
elems_left: self.size,
marker: marker::PhantomData,
/// Drops buckets in reverse order. It leaves the table in an inconsistent
/// state and should only be used for dropping the table's remaining
/// entries. It's used in the implementation of Drop.
unsafe fn rev_drop_buckets(&mut self) {
let first_raw = self.first_bucket_raw();
let mut raw = first_raw.offset(self.capacity as isize);
let mut elems_left = self.size;
while elems_left != 0 {
debug_assert!(raw.hash != first_raw.hash);
raw = raw.offset(-1);
if *raw.hash != EMPTY_BUCKET {
elems_left -= 1;
ptr::drop_in_place(raw.pair as *mut (K, V));
}
}
}
@ -964,43 +972,6 @@ impl<'a, K, V> Iterator for RawBuckets<'a, K, V> {
}
}
/// An iterator that moves out buckets in reverse order. It leaves the table
/// in an inconsistent state and should only be used for dropping
/// the table's remaining entries. It's used in the implementation of Drop.
struct RevMoveBuckets<'a, K, V> {
raw: RawBucket<K, V>,
hashes_end: *mut HashUint,
elems_left: usize,
// As above, `&'a (K,V)` would seem better, but we often use
// 'static for the lifetime, and this is not a publicly exposed
// type.
marker: marker::PhantomData<&'a ()>,
}
impl<'a, K, V> Iterator for RevMoveBuckets<'a, K, V> {
type Item = (K, V);
fn next(&mut self) -> Option<(K, V)> {
if self.elems_left == 0 {
return None;
}
loop {
debug_assert!(self.raw.hash != self.hashes_end);
unsafe {
self.raw = self.raw.offset(-1);
if *self.raw.hash != EMPTY_BUCKET {
self.elems_left -= 1;
return Some(ptr::read(self.raw.pair));
}
}
}
}
}
/// Iterator over shared references to entries in a table.
pub struct Iter<'a, K: 'a, V: 'a> {
iter: RawBuckets<'a, K, V>,
@ -1227,7 +1198,7 @@ unsafe impl<#[may_dangle] K, #[may_dangle] V> Drop for RawTable<K, V> {
unsafe {
if needs_drop::<(K, V)>() {
// avoid linear runtime for types that don't need drop
for _ in self.rev_move_buckets() {}
self.rev_drop_buckets();
}
}

3
src/libstd/process.rs
View File

@ -437,7 +437,10 @@ impl Command {
/// # Examples
///
/// Basic usage:
///
/// ```no_run
/// #![feature(command_envs)]
///
/// use std::process::{Command, Stdio};
/// use std::env;
/// use std::collections::HashMap;

8
src/test/run-pass/inference-changes-39485.rs → src/test/compile-fail/issue-10176.rs
View File

@ -8,12 +8,12 @@
// option. This file may not be copied, modified, or distributed
// except according to those terms.
fn g() {
&panic!()
}
fn f() -> isize {
(return 1, return 2)
//~^ ERROR mismatched types
//~| expected type `isize`
//~| found type `(_, _)`
//~| expected isize, found tuple
}
fn main() {}

17
src/test/compile-fail/issue-5500.rs Normal file
View File

@ -0,0 +1,17 @@
// Copyright 2013 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.
fn main() {
&panic!()
//~^ ERROR mismatched types
//~| expected type `()`
//~| found type `&_`
//~| expected (), found reference
}

7
src/test/run-pass/issue-15763.rs
View File

@ -8,8 +8,7 @@
// option. This file may not be copied, modified, or distributed
// except according to those terms.
#![allow(unused_features)]
#![allow(unreachable_code)]
#![allow(unknown_features)]
#![feature(box_syntax)]
#[derive(PartialEq, Debug)]
@ -29,14 +28,14 @@ struct Foo {
}
fn foo() -> Result<Foo, isize> {
return Ok::<Foo, isize>(Foo {
return Ok(Foo {
x: Bar { x: 22 },
a: return Err(32)
});
}
fn baz() -> Result<Foo, isize> {
Ok::<Foo, isize>(Foo {
Ok(Foo {
x: Bar { x: 22 },
a: return Err(32)
})

21
src/test/run-pass/issue-39984.rs Normal file
View File

@ -0,0 +1,21 @@
// 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.
// Regression test for issue #39984.
//
// The key here is that the error type of the `Ok` call ought to be
// constrained to `String`, even though it is dead-code.
fn main() {}
fn t() -> Result<(), String> {
return Err("".into());
Ok(())
}

4
src/test/run-pass/project-defer-unification.rs
View File

@ -11,8 +11,6 @@
// A regression test extracted from image-0.3.11. The point of
// failure was in `index_colors` below.
#![allow(unused)]
use std::ops::{Deref, DerefMut};
#[derive(Copy, Clone)]
@ -94,7 +92,7 @@ pub fn index_colors<Pix>(image: &ImageBuffer<Pix, Vec<u8>>)
-> ImageBuffer<Luma<u8>, Vec<u8>>
where Pix: Pixel<Subpixel=u8> + 'static,
{
let mut indices: ImageBuffer<Luma<u8>, Vec<u8>> = loop { };
let mut indices: ImageBuffer<_,Vec<_>> = loop { };
for (pixel, idx) in image.pixels().zip(indices.pixels_mut()) {
// failured occurred here ^^ because we were requiring that we
// could project Pixel or Subpixel from `T_indices` (type of