tree 5db74ce0ac033cdbf508587337085402f450f244
parent 8f26230e4554338b8522e891bc4aa3657a164160
author Jukka Lehtosalo <jukka.lehtosalo@iki.fi> 1788446025 +0100
committer GitHub <noreply@github.com> 1788446025 +0100
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[mypyc] Use shared value for Final attribute initialized in class body (#21932)

Use a module-level static for Final attributes initialized in class
body:
```
class C:
    X: Final = [1]  # Only one list allocated
```
Previously such final attributes where stored in the per-instance
struct, and a new object was allocated for each instance, which deviated
from Python semantics and was inefficient. Now the initializer is only
run once.

Final attributes that have a type with an overlapping error value like
`i64` are still not supported properly. This is left as follow-up work.

I used coding agent assist but reviewed the result manually and iterated
on it.