1928: Support `#[cfg(..)]` r=matklad a=oxalica
This PR implement `#[cfg(..)]` conditional compilation. It read default cfg options from `rustc --print cfg` with also hard-coded `test` and `debug_assertion` enabled.
Front-end settings are **not** included in this PR.
There is also a known issue that inner control attributes are totally ignored. I think it is **not** a part of `cfg` and create a separated issue for it. #1949Fixes#1920
Related: #1073
Co-authored-by: uHOOCCOOHu <hooccooh1896@gmail.com>
Co-authored-by: oxalica <oxalicc@pm.me>
Fixes#1807
This assist can transform expressions of the form `!x || !y` into
`!(x && y)`. This also works with `&&`.
This assist will only trigger if the cursor is on the central logical
operator.
The main limitation of this current implementation is that both operands
need to be an explicit negation, either of the form `!x`, or `x != y`.
More operands could be accepted, but this would complicate the implementation
quite a bit.
Forbidding block expressions entirely is too strict; instead, we should only
forbid them in contexts where we are parsing an optional RHS (i.e. the RHS of a
range expression).
Previously, the `as` operator was being parsed like a postfix expression, and
therefore being given the highest possible precedence. That caused it to bind
more tightly than prefix operators, which it should not. Instead, parse it
somewhat like a normal binary expression with some special-casing.
1945: Handle divergence in type inference for blocks r=flodiebold a=lnicola
Fixes#1944.
The `infer_basics` test is failing, not sure what to do about it.
Co-authored-by: Laurențiu Nicola <lnicola@dend.ro>
1815: Support correct `$crate` expansion in macros r=uHOOCCOOHu a=uHOOCCOOHu
This PR makes normal use cases of `$crate` from macros work as expected.
It makes more macros from `std` work. Type inference works well with `panic`, `unimplemented`, `format`, and maybe more.
Sadly that `vec![1, 2, 3]` still not works, but it is not longer an issue about macro.
Screenshot:
Co-authored-by: uHOOCCOOHu <hooccooh1896@gmail.com>
1912: add new editing API, suitable for modifying several nodes at once r=viorina a=matklad
r? @viorina
Co-authored-by: Aleksey Kladov <aleksey.kladov@gmail.com>
1895: Handle associated type shorthand (`T::Item`) (Second attempt) r=flodiebold a=flodiebold
This is only allowed for generic parameters (including `Self` in traits), and
special care needs to be taken to not run into cycles while resolving it,
because we use the where clauses of the generic parameter to find candidates for
the trait containing the associated type, but the where clauses may themselves
contain instances of short-hand associated types.
In some cases this is even fine, e.g. we might have `T: Trait<U::Item>, U:
Iterator`. If there is a cycle, we'll currently panic, which isn't great, but
better than overflowing the stack...
Co-authored-by: Florian Diebold <flodiebold@gmail.com>
This is only allowed for generic parameters (including `Self` in traits), and
special care needs to be taken to not run into cycles while resolving it,
because we use the where clauses of the generic parameter to find candidates for
the trait containing the associated type, but the where clauses may themselves
contain instances of short-hand associated types.
In some cases this is even fine, e.g. we might have `T: Trait<U::Item>, U:
Iterator`. If there is a cycle, we'll currently panic, which isn't great, but
better than overflowing the stack...
