Point to let when modifying field of immutable variable
Point at the immutable local variable when trying to modify one of its
fields.
Given a file:
```rust
struct Foo {
pub v: Vec<String>
}
fn main() {
let f = Foo { v: Vec::new() };
f.v.push("cat".to_string());
}
```
present the following output:
```
error: cannot borrow immutable field `f.v` as mutable
--> file.rs:7:13
|
6 | let f = Foo { v: Vec::new() };
| - this should be `mut`
7 | f.v.push("cat".to_string());
| ^^^
error: aborting due to previous error
```
Fix#27593.
Add feature gate for rvalue-static-promotion
Probably needs more tests (which ones?) and there may be other things that need to be done. Also not sure whether the version that introduces the flag is really `1.15.1`.
See https://github.com/rust-lang/rfcs/pull/1414.
Updates #38865.
Library stabilizations for 1.17
Details of the stabilizations are available in the commits. Includes only library stabilizations; there are a couple of compiler stabilizations that should also be done for 1.17.
Will need a beta backport, which I will create after approval.
r? @alexcrichton
Update the cargo submodule again
Unfortunately it was reverted back to a broken state in
e06c51553ddc202a79f2c0b76822ad56c4a30f80 by accident, so let's bring it forward
again!
Closes https://github.com/rust-lang/cargo/issues/3844
travis: Ensure cargo links libcurl statically
We don't want a dynamic dependency in the library that we ship, so link it
statically by configuring curl-sys's build script to not pick up the system
version via pkg-config.
Ignore the type of error altogether. The rationale is: it doesn't matter
what was the problem if the directory is there. In the previous versions
if the directory was there already we wouldn't even attempt to create
it, so we wouldn't know about the problem neither.
Make test path length smaller in `concurrent_recursive_mkdir` test.
It is more robust to not fail if any directory in a path was created
concurrently. This change lifts rustc internal `create_dir_racy` that
was created to handle such conditions to be new `create_dir_all`
implementation.
Drop of arrays is now translated in trans::block in an ugly way that I
should clean up in a later PR, and does not handle panics in the middle
of an array drop, but this commit & PR are growing too big.
These changes are in the same commit to avoid needing to adapt
meth::trans_object_shim to the new scheme.
One codegen-units test is broken because we instantiate the shims even
when they are not needed. This will be fixed in the next PR.
