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Warnings for big copies: a struct with 256+ bytes of plain data as a parameter or in for x in list

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- on stderr (finch ir stays the IR), as yellow warnings in editors (@W in the index), once per place
- str, arrays and maps inside a struct don't count: passing it copies only their handles
- none in the compiler, the examples or the tests other than the new one
- docs: the warning instead of "not planned"; what was and wasn't checked for Android

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016GzNP6r8dg6WDxUVZy8wjL
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Nexoniarz 2026-10-29 12:15:22 +01:00
commit d557b5505e
15 changed files with 210 additions and 18 deletions
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tests/new/big_copies.out Normal file
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new/big_copies.fch:27:11: warning: 'b' is a Body (264 bytes), copied on every call to weight; take ptr[Body] to share it instead (callers can still pass the variable as it is)
new/big_copies.fch:45:5: warning: each Body (264 bytes) is copied into 'x'; for i in 0..bodies.len with bodies[i] works on it in place
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