review comment: use RFC example for compile-fail/issue28498-reject-ex1.rs
(It is not *exactly* the text from the RFC, but the only thing it adds
is a call to a no-op function that is just an attempt to make it clear
where the potential for impl specialization comes from.)
One just checks that we are feature-gating the UGEH attribute (as
usual for attributes associated with unstable features).
The other is adapted from the RFC 1238 text, except that it has been
extended somewhat to actually *illustrate* the scenario that we are
trying to prevent, namely observing the state of data, from safe code,
after the destructor for that data has been executed.
Illustrates cases that worked before and must continue to work, and a
case that shows how to use the `unsafe_destructor_blind_to_params`
attribute (aka "the UGEH attribute") to work around
cannot-assume-parametricity.
Add RFC 1238's `unsafe_destructor_blind_to_params` (UGEH) where needed.
I needed it in `RawVec`, `Vec`, and `TypedArena` for `rustc` to
bootstrap; but of course that alone was not sufficient for `make
check`.
Later I added `unsafe_destructor_blind_to_params` to collections, in
particular `LinkedList` and `RawTable` (the backing representation for
`HashMap` and `HashSet`), to get the regression tests exercising
cyclic structure from PR #27185 building.
----
Note that the feature is `dropck_parametricity` (which is not the same
as the attribute's name). We will almost certainly vary our strategy
here in the future, so it makes some sense to have a not-as-ugly name
for the feature gate. (The attribute name was deliberately selected to
be ugly looking.)
bors [Mon, 5 Oct 2015 03:06:33 +0000 (03:06 +0000)]
Auto merge of #28748 - nikomatsakis:universal-mir, r=pnkfelix
I had to fix a few things. Notable changes:
1. I removed the MIR support for constants, instead falling back to the existing `ConstVal`. I still think we ought to reform how we handle constants, but it's not clear to me that the approach I was taking is correct, and anyway I think we ought to do it separately.
2. I adjusted how we handle bindings in matches: we now *declare* all the bindings up front, rather than doing it as we encounter them. This is not only simpler, since we don't have to check if a binding has already been declared, it avoids ICEs if any of the arms turn out to be unreachable.
3. I do MIR construction *after* `check_match`, because it detects various broken cases. I'd like for `check_match` to be subsumed by MIR construction, but we can do that as a separate PR (if indeed it makes sense).
I did a crater run and found no regressions in the wild: https://gist.github.com/nikomatsakis/0038f90e10c8ad00f2f8
Niko Matsakis [Tue, 29 Sep 2015 21:08:05 +0000 (17:08 -0400)]
change PartialEq impl for ConstVal so that two constants are `==`
if they represent the same constant; otherwise the match algorithm
goes into infinite recursion when a pattern contains `NaN`
Niko Matsakis [Tue, 29 Sep 2015 14:49:24 +0000 (10:49 -0400)]
rather than just passing the block around, track the candidate's index,
and track which arms are reached (though in fact we don't make use of
this right now -- we might later if we absorb the checking of patterns
into MIR, as I would like)
bors [Sun, 4 Oct 2015 23:30:40 +0000 (23:30 +0000)]
Auto merge of #28573 - ruud-v-a:rustdoc-license, r=brson
The output of rustdoc includes resources licensed under the SIL Open
Font License, the MIT license, and the Apache License 2.0. All of these
licenses permit redistribution provided that the license text is also
redistributed. Previously this was not the case, making rustdoc output
unsuitable for distribution by default. This resolves that problem by
including the license texts in rustdoc output.
See also: https://users.rust-lang.org/t/licensing-rustdoc-output/2880
bors [Sun, 4 Oct 2015 19:50:50 +0000 (19:50 +0000)]
Auto merge of #28806 - wthrowe:bare-outfile-fix, r=alexcrichton
The reason this was not failing is fascinating. The variable $(rustc)
is empty, so the make recipe was expanded as " -o foo foo.rs". make
interpreted this as an instruction to run the command "o foo foo.rs"
and ignore any failure that occurred, because it uses a leading '-' on
a command to signal that behavior.
bors [Sun, 4 Oct 2015 14:18:28 +0000 (14:18 +0000)]
Auto merge of #28832 - sarcas:docs-uneeded-done-in-library-example, r=steveklabnik
"Rust Inside Other Languages" in the Rust book includes a library example. The reference specifies printing "done!" when the code finishes running, and the language examples (Ruby, Python, JS) all do this in their code.
However, the Rust library example code *also* does this, so that the examples as written would output "done!" twice.
This commit removes the "done!" from the Rust example code to tidy up the output to match expectations.
James Bell [Sun, 4 Oct 2015 09:44:00 +0000 (10:44 +0100)]
Docs: Removes duplicate output from FFI example
The "Rust Inside Other Languages" page includes a library example. The
reference specifies printing "done!" when the code finishes running, and
the language examples (Ruby, Python, JS) all do this in their code.
However, the Rust library example code *also* does this, so that the
examples as written would output "done!" twice.
This removes the "done!" from the Rust example code to clarify the docs.
bors [Sat, 3 Oct 2015 22:07:37 +0000 (22:07 +0000)]
Auto merge of #28669 - arielb1:well-formed-methods, r=nikomatsakis
By RFC1214:
> Before calling a fn, we check that its argument and return types are WF.
The previous code only checked the trait-ref, which was not enough
in several cases.
As this is a soundness fix, it is a [breaking-change]. Some new annotations are needed, which I think are because of #18653 and the imperfection of `projection_must_outlive` (that can probably be worked around by moving the wf obligation later).
William Throwe [Fri, 2 Oct 2015 03:05:25 +0000 (23:05 -0400)]
Fix run-make/bare-outfile test
The reason this was not failing is fascinating. The variable $(rustc)
is empty, so the make recipe was expanded as " -o foo foo.rs". make
interpreted this as an instruction to run the command "o foo foo.rs"
and ignore any failure that occurred, because it uses a leading '-' on
a command to signal that behavior.
bors [Sat, 3 Oct 2015 07:50:47 +0000 (07:50 +0000)]
Auto merge of #28815 - matklad:contrib-doc, r=steveklabnik
This adds a paragraph on how to generate documentation without sloooow `make doc`. I'm not a native English speaker, so there might be some language related bugs (I wish English was as hard to get wrong, as Rust)
This also includes whitespace cleanup of contributing.md in a separate commit. Whiltespace is not significant in github flavored markdown, and my Emacs just cleans ws automatically :)
By RFC1214:
Before calling a fn, we check that its argument and return types are WF. This check takes place after all higher-ranked lifetimes have been instantiated. Checking the argument types ensures that the implied bounds due to argument types are correct. Checking the return type ensures that the resulting type of the call is WF.
The previous code only checked the trait-ref, which was not enough
in several cases.
As this is a soundness fix, it is a [breaking-change].
bors [Fri, 2 Oct 2015 16:33:26 +0000 (16:33 +0000)]
Auto merge of #28768 - alexcrichton:dep-info++, r=brson
This PR closes out #28716 and #28735 by making two changes to the compiler:
1. The `--emit` flag to the compiler now supports the ability to specify the output file name of a partuclar emit type. For example `--emit dep-info=bar.d,asm=foo.s,link` is now accepted.
2. The dep-info emission now emits a dummy target for all input file names to protect against deleted files.
Previously only keyup event was looked at, which meant that pasting, cutting and
otherwise changing the input without typing would not catch any updates to the
search query.
Please correct me if I confused something but the documentation for ```into_ptr``` and ```into_raw``` of ```CString``` seem to be swapped as the docs for ```into_ptr``` mentions ```into_raw``` and vice versa.
Update: I actually meant ```into_ptr``` and ```into_raw``` NOT ```from_*```
Rollup merge of #28686 - eefriedman:unresolved-path-error, r=nikomatsakis
The behavior here isn't really ideal, but we can't really do much better
given the current state of constant evaluation.
The changes to ExprUseVisitor are to avoid a compile error; apparently
that bit of code is extremely sensitive to changes in other areas of the
compiler.
bors [Thu, 1 Oct 2015 18:16:08 +0000 (18:16 +0000)]
Auto merge of #28746 - aidanhs:aphs-musl-linking-no-cxxabi, r=alexcrichton
On reading https://github.com/alexcrichton/port-of-rust/blob/master/musl/Dockerfile I was surprised to see no libcxxabi. I experimented, and it does seem to be unnecessary.
bors [Thu, 1 Oct 2015 16:26:28 +0000 (16:26 +0000)]
Auto merge of #28742 - nikomatsakis:def-id-encapsulate, r=eddyb
As described in https://github.com/rust-lang/rfcs/pull/1298, the idea here is to make DefIds independent of changes to the content of other items. They are also *mostly* independent from ordering, so e.g. reordering two functions will change the defids, but it will not change the paths that they expand into (but this is not the case for some things, such as impls).
This is a major refactoring, so I did it in slices. The final commit is in some sense The Big One where most of the work is done. The earlier commits just pave the way by gradually refactoring accesses to the `node` field.
This is a [breaking-change] for plugin authors. The things you need to do to migrate your code are as follows:
1. For local def-ids, rather than do `def_id.node`, call `tcx.map.as_local_node_id(def_id)`.
2. To construct a local def-id, call `tcx.map.local_def_id(node_id)`.
3. Note that you cannot make def-ids for any node, but only for "definitions" -- which include all items, as well as a number of other things, but not e.g. arbitrary expressions.
4. You can get the path to a def-id by calling `tcx.def_path(def_id)`.
One thing that is NOT part of this PR, but which I plan do in a follow-up, is converting uses of the existing `with_path` API to use `def_path`, which is basically the same.
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