This PR extends compiletest to support **test revisions** and with a preliminary **incremental testing harness**. run-pass, compile-fail, and run-fail tests may be tagged with
```
// revisions: a b c d
```
This will cause the test to be re-run four times with `--cfg {a,b,c,d}` in turn. This means you can write very closely related things using `cfg`. You can also configure the headers/expected-errors by writing `//[foo] header: value` or `//[foo]~ ERROR bar`, where `foo` is the name of your revision. See the changes to `coherence-cow.rs` as a proof of concept.
The main point of this work is to support the incremental testing harness. This PR contains an initial, unused version. The code that uses it will land later. The incremental testing harness compiles each revision in turn, and requires that the revisions have particular names (e.g., `rpass2`, `cfail3`), which tell it whether a particular revision is expected to compile or not.
Two questions:
- Is there compiletest documentation anywhere I can update?
- Should I hold off on landing the incremental testing harness until I have the code to exercise it? (That will come in a separate PR, still fixing a few details)
r? @alexcrichton
cc @rust-lang/compiler <-- new testing capabilities
This commit removes all unstable and deprecated functions in the standard
library. A release was recently cut (1.3) which makes this a good time for some
spring cleaning of the deprecated functions.
`assert_eq!` has better diagnostics than `assert!` and is more helpful when something actually breaks, but the diagnostics has it's price - `assert_eq!` generate some formatting code which is slower to compile and possibly run.
[My measurements](https://internals.rust-lang.org/t/assert-a-b-or-assert-eq-a-b/1367/12?u=petrochenkov) show that presence of this formatting code doesn't affect compilation + execution time of the test suite significantly, so `assert_eq!` can be used instead of `assert!` consistently.
(Some tests doesn't reside in src/test, they are not affected by these changes, I'll probably open a separate PR for them later)
This test has an interesting history, because of fail -> panic. It was
originally called extern-fail.rs:
https://github.com/rust-lang/rust/commits/master/src/test/run-fail/extern-fail.rs
It lived for a while, but was disabled in August 2013:
ce95b01014
As you can see, that failure was not specific to this test, however,
this code does stuff with the runtime, which was removed. Given that
it hasn't even been able to compile in a long time, we should just
remove it.
r? @brson
Two commits here: one which removes a bunch of tests, and re-enables a few that work.
Second updates the syntax of one of the failing tests. It still doesn't pass, but at least it compiles.
Most of these are old, but some specific messages for specific tests:
* trait-contravariant-self.rs: failed due to a soundess hole:
05e3248a79
* process-detatch: 15966c3c1f
says "this test is being ignored until signals are implemented" That's
not happening for a long time, and when it is, we'll write tests for
it.
* deep-vector{,2}.rs: "too big for our poor macro infrastructure", and has
been ignored over a year.
* borrowck-nested-calls.rs's FIXME #6268 was closed in favor of
rust-lang/rfcs#811
* issue-15167.rs works properly now
* issue-9737.rs works properly now
* match-var-hygiene.rs works properly now
Addresses a chunk of #3965
This test has an interesting history, because of fail -> panic. It was
originally called extern-fail.rs:
https://github.com/rust-lang/rust/commits/master/src/test/run-fail/extern-fail.rs
It lived for a while, but was disabled in August 2013:
ce95b01014
As you can see, that failure was not specific to this test, however,
this code does stuff with the runtime, which was removed. Given that
it hasn't even been able to compile in a long time, we should just
remove it.
An automated script was run against the `.rs` and `.md` files,
subsituting every occurrence of `task` with `thread`. In the `.rs`
files, only the texts in the comment blocks were affected.
This is a deprecated attribute that is slated for removal, and it also affects
all implementors of the trait. This commit removes the attribute and fixes up
implementors accordingly. The primary implementation which was lost was the
ability to compare `&[T]` and `Vec<T>` (in that order).
This change also modifies the `assert_eq!` macro to not consider both directions
of equality, only the one given in the left/right forms to the macro. This
modification is motivated due to the fact that `&[T] == Vec<T>` no longer
compiles, causing hundreds of errors in unit tests in the standard library (and
likely throughout the community as well).
Closes#19470
[breaking-change]
This commit cleans out a large amount of deprecated APIs from the standard
library and some of the facade crates as well, updating all users in the
compiler and in tests as it goes along.
This is a deprecated attribute that is slated for removal, and it also affects
all implementors of the trait. This commit removes the attribute and fixes up
implementors accordingly. The primary implementation which was lost was the
ability to compare `&[T]` and `Vec<T>` (in that order).
This change also modifies the `assert_eq!` macro to not consider both directions
of equality, only the one given in the left/right forms to the macro. This
modification is motivated due to the fact that `&[T] == Vec<T>` no longer
compiles, causing hundreds of errors in unit tests in the standard library (and
likely throughout the community as well).
cc #19470
[breaking-change]
This reverts commit aec67c2.
Closes#20012
This is temporarily rebased on #23245 as it would otherwise conflict, the last commit is the only one relevant to this PR though.
In case that there is a destination for the array, like in
"let x = [expr; n]", we currently don't evaluate the given expression if
n is zero. That's inconsistent with all other cases, including "[expr;
0]" without a destination.
Fixes#23354
