<img width="433" height="145" alt="Image" src="https://github.com/user-attachments/assets/63c59320-303e-4a19-baf7-28ff651304f9" /> let (a,b,c) = (?=1, 2, b=3) in c evaluates to b=3 as a tuplabel. This should be indet or the pattern should be autolabelled.