Allow no whitespace after lambda body in certain cases #939
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See python/cpython#23317 Raised in #930.
For an expression like `f"{one:{two:}{three}}"`, `three` is not in an f-string spec, and should be tokenized accordingly.
This PR fixes the `format_spec_count` bookkeeping in the tokenizer, so it properly decrements it when a closing `}` is encountered but only if the `}` closes a format_spec.
Reported in #930.
This is an obscure one. `_ if 0else _` failed to parse with some very weird errors. It turns out that the tokenizer tries to parse `0else` as a single number, but when it encounters `l` it realizes it can't be a single number and it backtracks. Unfortunately the backtracking logic was broken, and it failed to correctly backtrack one of the offsets used for whitespace parsing (the byte offset since the start of the line). This caused whitespace nodes to refer to incorrect parts of the input text, eventually resulting in the above behavior. This PR fixes the bookkeeping when the tokenizer backtracks. Reported in #930.
Python accepts code where `lambda` follows a `*`, so this PR relaxes validation rules for Lambdas. Raised in #930.
This PR relaxes the accepted types for the `elt` field in `ListComp`, `SetComp`, and `GenExp`, as well as the `key` and `value` fields in `DictComp`. Fixes #500.
Like in `with foo()as():pass` Raised in #930.
Like in `[_:=''for _ in _]` Raised in #930.
Like in `[lambda:()for _ in _]` Reported in #930.
This was referenced May 28, 2023
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❗ Your organization is not using the GitHub App Integration. As a result you may experience degraded service beginning May 15th. Please install the Github App Integration for your organization. Read more. Additional details and impacted files@@ Coverage Diff @@
## main #939 +/- ##
==========================================
- Coverage 90.92% 90.92% -0.01%
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Files 254 254
Lines 25937 25955 +18
==========================================
+ Hits 23584 23600 +16
- Misses 2353 2355 +2
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Allow no whitespace after lambda body in certain cases
Like in
[lambda:()for _ in _]Reported in #930.
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asin a contextmanager in certain cases #9370else#933