while I'm at it, remove the "extra caching" that I was doing for no good
reason except laziness. Basically before I was caching at each scope in
the chain, but there's not really a reason to do that, since the cached
entry point at level N is always equal to the last cached exit point
from level N-1.
It's nice to be able to index with a scope-id,
but coherence rules prevent us from implementing
`Index<ScopeId>` for `Vec<ScopeAuxiliary>`, and I'd
prefer that `ScopeAuxiliary` remain in librustc_mir,
just for compilation time reasons.
This was triggered by me wanting to address a use of DUMMY_SP, but
actually I'm not sure what would be a better span -- I guess the span
for the function as a whole.
convert 99.9% of `try!`s to `?`s
The first commit is an automated conversion using the [untry] tool and the following command:
```
$ find -name '*.rs' -type f | xargs untry
```
at the root of the Rust repo.
[untry]: https://github.com/japaric/untry
cc @rust-lang/lang @alexcrichton @brson
Introduce 'cargotest' and the check-cargotest buildstep
This is a new suite of tests that verifies that the compiler builds specific revisions of select crates from crates.io.
It does not run by default. It is intended that bors runs these tests against all PRs, and gates on them. In this way we will make it harder still to break important swaths of the ecosystem, even on nightly.
This is a very basic implementation intended for feedback. The biggest thing it probably should do but doesn't is use a lockfile for every project it builds.
r? @alexcrichton cc @rust-lang/lang @rust-lang/libs
Automated conversion using the untry tool [1] and the following command:
```
$ find -name '*.rs' -type f | xargs untry
```
at the root of the Rust repo.
[1]: https://github.com/japaric/untry
std: Change `encode_utf{8,16}` to return iterators
Currently these have non-traditional APIs which take a buffer and report how
much was filled in, but they're not necessarily ergonomic to use. Returning an
iterator which *also* exposes an underlying slice shouldn't result in any
performance loss as it's just a lazy version of the same implementation, and
it's also much more ergonomic!
cc #27784
This is a new suite of tests that verifies that the compiler
builds specific revisions of select crates from crates.io.
It does not run by default. It is intended that buildbot
runs these tests against all PRs, and gate on them.
Currently these have non-traditional APIs which take a buffer and report how
much was filled in, but they're not necessarily ergonomic to use. Returning an
iterator which *also* exposes an underlying slice shouldn't result in any
performance loss as it's just a lazy version of the same implementation, and
it's also much more ergonomic!
cc #27784
Move analysis for MIR borrowck
This PR adds code for doing MIR-based gathering of the moves in a `fn` and the dataflow to determine where uninitialized locations flow to, analogous to how the same thing is done in `borrowck`.
It also adds a couple attributes to print out graphviz visualizations of the analyzed MIR that includes the dataflow analysis results.
cc @nikomatsakis
