dimgigov 636c49e9df feat: improve borrow checker — reinitialization, assignment move, return move ...

- Add isOwn field to Symbol for tracking own T declarations
- Reinitialization after move: assigning to a moved variable removes it from movedVars
- Move tracking in let/var initialization: var b: own Box = a moves a
- Move tracking in assignment: x = y moves y if y is own T
- Move tracking in return: return x moves x if x is own T
- Expand borrow_test.nim to 10 tests (all passing)

2026-06-05 21:56:47 +03:00

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