We have a lot of these. Some of them are harmless, if unidiomatic, such
as `if (condition)`, others are potentially dangerous `assert(...)`, as
`assert(condtion)` works as expected, but `assert(condition, message)`
will result in an assertion that never triggers, as what you're actually
asserting is `bool(tuple[2])`, which will always be true.
There are two changes here, one is to remove an `elif` that is
effectively an `else`, that helps the type checker and provides a small
speedup potentially. The second is a potentially unbound variable, that
currently isn't hit, but very much could be.
When mutable items are stored in an lru cache, changing the returned
items changes the cached items as well. Therefore we want to ensure that
we're not mutating them. Using the ImmutableListProtocol allows mypy to
find mutations and reject them. This doesn't solve the problem of
mutable values inside the values, so you could have to do things like:
```python
ImmutableListProtocol[ImmutableListProtocol[str]]
```
or equally hacky. It can also be used for input types and acts a bit
like C's const:
```python
def foo(arg: ImmutableListProtocol[str]) -> T.List[str]:
arg[1] = 'foo' # works while running, but mypy errors
```
* Allow address sanitizer for Visual Studio 2019 version 16.9
Address Sanitizer was first supported with the current syntax in Visual
Studio 16.9.0 (cl version 19.28.29910).
* VS: Convert /fsanitize=address to project file setting
This gets rid of compile warnings, and simplifies the code.
Note that `work_dir` in sanity_check_impl was incorrect,
it was used both to prepend to file names and as cwd=work_dir
argument to Popen. This is fixed here.
Closes gh-7344
They are supposed to have different behavior. The environment variables
apply to both the compiler and linker when the compiler acts as a
linker, but the command line ones do not.
Fixes#8345
Dylan Baker
Tristan Partin
Jussi Pakkanen
miebka
David Seifert
Paolo Bonzini
Pamplemousse
Andrea Pappacoda
Eli Schwartz
Daniel Mensinger
Ian Harvey
Justin Handville
Volker-Weissmann
Peter Harris
Alexander Neumann
Ralf Gommers