Backport of PRs to Beta #25004
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Backport of PRs to Beta #25004
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Conflicts: src/libsyntax/parse/parser.rs
Currently if a standard I/O handle is set to inherited on Windows, no action is taken and the slot in the process information description is set to `INVALID_HANDLE_VALUE`. Due to our passing of `STARTF_USESTDHANDLES`, however, this means that the handle is actually set to nothing and if a child tries to print it will generate an error. This commit fixes this behavior by explicitly creating stdio handles to be placed in these slots by duplicating the current process's I/O handles. This is presumably what previously happened silently by using a file-descriptor-based implementation instead of a `HANDLE`-centric implementation. Along the way this cleans up a lot of code in `Process::spawn` for Windows by ensuring destructors are always run, using more RAII, and limiting the scope of `unsafe` wherever possible.
[breaking-change]
What does this break? Basically, code that implements `Drop` and is
using `T:Copy` for one of its type parameters and is relying on the
Drop Check rule not applying to it.
Here is an example:
```rust
#![allow(dead_code,unused_variables,unused_assignments)]
struct D<T:Copy>(T);
impl<T:Copy> Drop for D<T> { fn drop(&mut self) { } }
trait UserT { fn c(&self) { } }
impl<T:Copy> UserT for T { }
struct E<T:UserT>(T);
impl<T:UserT> Drop for E<T> { fn drop(&mut self) { } }
// This one will start breaking.
fn foo() { let (d2, d1); d1 = D(34); d2 = D(&d1); }
#[cfg(this_one_does_and_should_always_break)]
fn bar() { let (e2, e1); e1 = E(34); e2 = E(&e1); }
fn main() {
foo();
}
```
use visible characters for the multibyte character filler.
THis includes tests for struct and enum. (I suspect the closure case is actually unreachable, but i see no harm in including it.)
|
r? @pcwalton (rust_highfive has picked a reviewer for you, use r? to override) |
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Cherry pick of the following PRs:
Copyfrom special-cased traits #24906MultiByteChar#24932#[repr(C)]with Drop #24935