# Function signature matches but still fails

**URL:** https://numba.discourse.group/t/function-signature-matches-but-still-fails/3224
**Category:** Support: What is this error message?
**Created:** [January 29, 2026, 10:38am UTC](https://numba.discourse.group/t/function-signature-matches-but-still-fails/3224 "2026-01-29T10:38:27Z")
**Posts on this page:** 1
**Showing post:** 4

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### Author: ![nelson2005](https://yyz2.discourse-cdn.com/free1/user_avatar/numba.discourse.group/nelson2005/32/47_2.png) [@nelson2005](https://numba.discourse.group/u/nelson2005)
#### Post date: [January 29, 2026, 9:34pm UTC](https://numba.discourse.group/t/function-signature-matches-but-still-fails/3224/4 "2026-01-29T21:34:12Z")

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For next time, it may be better to let Numba infer the signature and then inspect it with [nopython\_signatures](https://numba.discourse.group/t/numba-generator-function-throws-typing-error/2692/3). That’ll likely show what @gmarkall referenced

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