facebook / facebook/pyrefly

Infer generic callable signatures

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#3,355 1 comment 1 reaction 0 assignees View on GitHub
typechecking
Dominant language
Rust
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Description

### Describe the Bug

For lambdas, arguments should get generic types instead of Unknown, since then type inference can be done for the return types upon usage. See the sandbox for an examples.

### Sandbox Link

https://pyrefly.org/sandbox/?project=N4IgZglgNgpgziAXKOBDAdgEwEYHsAeAdAA4CeS4ATrgLYAEALqcROgOZ0Q3G6UN0AqADrow1emACu6AMYNcuKHE7de-Yqj4RUUESOybEdOA0p0AvHSEgDla3tEAGC3Sioa2TKjpgFRyjAAbjA6APpMxDAAFL64AJR0dADEdKjKMPiRcjCYdFEAqugA1ui4AO7ocSIBwWER0WCOCcl0GVn8ANoAKgC6MX50XQkAtAB8g9VBIVDhzA2OUbZxCSltMHLGpg6YMGA%2BAIxRcYgiiYkBDJKU6D4LS5O1M-Ux%2B82rmev8R3Rjm3boD2ms0iLyOK1aHw2Jn%2B212dDYjm6fViRiGYy6JxuZwuVxusUBdTmUQRb1S6UhDByRiR-VwqJG4y6sL2bEOx1O2Jgl2u8Lumiq6BqQOerNJaQh7SpeQZfxAABoQGQAmAoKRCPIaFAKCkAAqkZWq4wYHAEOgyXCiCBsK6oBgQC2EEQpADKMBgdAAFgwGMQ4IgAPT%2BpW7VWEXhsf0wdD%2BzC4GRwf3my3Wyi2%2B3Rny8VKBVDQVDYWBmi2QFNpi10XDEO0WuCO9BkBgei3DYKUODplzWADMhH2ACZ7OgOjBKNQ2z0RNIuDw%2BDlhpgIAE5BBgi4AORW0oBNciUoMYYBACOkkXc6KMFIw1QMhk8GUljXZU06B36BAAF8Fde7cEAGLQGAKDQLA8CIMgPyAA

### (Only applicable for extension issues) IDE Information

_No response_

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