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closes #21659
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CC #30642
r? @Gankro
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Are trait impls still insta-stable? Considering that this design has been around for a long time on `String` and `OsString` it probably doesn't matter much...
The `From` impl is a bit strange to me. It's stolen from `OsString` but I'm not really sure about it... `String` just impls `From<&str>` instead, would that make more sense?
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CC #30642
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- Successful merges: #30365, #30565, #30590, #30630
- Failed merges:
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Previously, all references to closure arguments went to the argument before the one they should (e.g. to `arg1` when it was supposed to go to `arg2`). This was because the MIR builder did not account for the implicit arguments that come before the explicit arguments, and closures have one implicit argument - the struct containing the captures.
This is my test code and a diff of the MIR generated for the closure:
```rust
let a = 2i32;
let _f = |b: i32| -> i32 { a + b }:
```
```diff
--- old 2015-12-29 23:16:32.027926372 -0600
+++ new 2015-12-29 23:16:42.975400757 -0600
@@ -1,22 +1,22 @@
fn(arg0: &[closure@closure-args.rs:8:14: 8:39 a:&i32], arg1: i32) -> i32 {
let var0: i32; // b
let tmp0: ();
let tmp1: i32;
let tmp2: i32;
bb0: {
- var0 = arg0;
+ var0 = arg1;
tmp1 = (*(*arg0).0);
tmp2 = var0;
ReturnPointer = Add(tmp1, tmp2);
goto -> bb1;
}
bb1: {
return;
}
bb2: {
diverge;
}
}
```
(If you're wondering where this text MIR output comes from, it's from another branch of mine waiting on https://github.com/rust-lang/rust/pull/30602 to get merged.)
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This moves back (essentially reverts #30265) into MIR-specific translation code, but keeps the
funcition split out, since it is expected to eventually become recursive.
Fixes https://github.com/rust-lang/rust/issues/29572
cc @oli-obk
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This PR changes the `emit_opaque` and `read_opaque` methods in the RBML library to use a space-efficient binary encoder that does not emit any tags and uses the LEB128 variable-length integer format for all numbers it emits.
The space savings are nice, albeit a bit underwhelming, especially for dynamic libraries where metadata is already compressed.
| RLIBs | NEW | OLD |
|--------------|--------|-----------|
|libstd | 8.8 MB | 10.5 MB |
|libcore |15.6 MB | 19.7 MB |
|libcollections| 3.7 MB | 4.8 MB |
|librustc |34.0 MB | 37.8 MB |
|libsyntax |28.3 MB | 32.1 MB |
| SOs | NEW | OLD |
|---------------|-----------|--------|
| libstd | 4.8 MB | 5.1 MB |
| librustc | 8.6 MB | 9.2 MB |
| libsyntax | 7.8 MB | 8.4 MB |
At least this should make up for the size increase caused recently by also storing MIR in crate metadata.
Can this be a breaking change for anyone?
cc @rust-lang/compiler
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Since `darwin` is really `apple-darwin`, the valgrind-rpass tests were not actually being run with valgrind on mac before. Also, the `HOST` check was completely wrong.
r? @alexcrichton
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This hairy conditional doesn't need to be so. It _does_ need to be a
thin pointer, otherwise, it will fail to compile, so let's pull that out
into a temporary for future readers of the source.
/cc @nrc @SimonSapin @Gankro @durka , who brought this up on IRC
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The previous version using `PartialOrd::le` was broken since it passed `T` arguments where `&T` was expected.
It makes sense to use primitive comparisons since range patterns can only be used with chars and numeric types.
r? @eddyb
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The current help message is too much about "normal" macros to be used
as general message. Keep it for normal macros, and add custom help and
error messages for macro definitions.
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I think that should pretty much conclude all of https://github.com/rust-lang/rust/issues/29576.
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RESTRICTION_STMT_EXPR restriction to allow subsequent expressions to
contain braces.
https://github.com/rust-lang/rust/issues/28777
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Fixes #30521 and #30627 by adding new snapshots
edunham uploaded the snapshots.
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This adds a constructor for a Weak that can never be upgraded. These are
mostly useless, but for example are required when deserializing.
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This hairy conditional doesn't need to be so. It _does_ need to be a
thin pointer, otherwise, it will fail to compile, so let's pull that out
into a temporary for future readers of the source.
Also, after a discussion with @pnkfelix and @gankro, we don't need these
null checks anymore, as zero-on-drop has been gone for a while now.
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The previous version using `PartialOrd::le` was broken since it passed `T`
arguments where `&T` was expected.
It makes sense to use primitive comparisons since range patterns can only be
used with chars and numeric types.
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- Successful merges: #30373, #30502, #30511, #30546, #30556, #30620
- Failed merges:
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The current help message is too much about "normal" macros to be used
as general message. Keep it for normal macros, and add custom help and
error messages for macro definitions.
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As discussed in issue #30568.
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Resolves #30507
r? @steveklabnik
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Rewrite of a paragraph in in the `match` section.
The colon `:` should be used only when the sentence preceeding it is a
complete sentence. If this is not the case, then a `;` should be used;
this denotes that the following fragment is a part of the previous
fragment.
I got a new bike; it has two wheels. (Similar to I got a new bike, it has two wheels)
The ice cream truck has great flavours; blueberry, blackberry, berryberry.
Writing a complete sentence:
- with a list under it
- You can join two sentences with it: Much like this.
r? @steveklabnik
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The current explanation for scan() is not very clear as to how it works, especially when it compares itself to fold().
I believe these changes makes it all a bit more clear for the reader, and makes it easier to understand the example code.
r? @steveklabnik
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As discussed [here](https://internals.rust-lang.org/t/more-structured-errors/3005)
r? @nikomatsakis or anyone else on the @rust-lang/compiler team
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This PR siliences some warnings when compiling stdlib with --test. Mostly remove some unused imports and added a few `#[allow(..)]`.
I also marked some signal handling functions with `#[cfg(not(test))]`, because they are only called through `rt::lang_start`, which is also marked as `#[cfg(not(test))]`
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Previously, all references to closure arguments went to the argument before the
one they should (e.g. to arg1 when it was supposed to be arg2). This was because
the MIR builder did not account for the implicit arguments that come before the
explicit arguments, and closures have one implicit argument - the struct
containing the captures.
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