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Reboot of #16195 (#16746)

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* fix #16185

* fix test

* fix comment

* fix comment

* better approach

* Add more tests and move sameLocation to injectdestructors

* Better and more strict sameLocation

* Small cleanup and preliminary spec clarification

* Fix

* Fix doc

* Expand test

Co-authored-by: Andrey R (cooldome) <ariabushenko@gmail.com>
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Clyybber 2021-01-20 11:05:56 +01:00 • committed by GitHub
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10
doc/destructors.rst
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@ -376,8 +376,14 @@ it's subtle.
The simple case of ``x = x`` cannot be turned
into ``=sink(x, x); wasMoved(x)`` because that would lose ``x``'s value.
The solution is that simple self-assignments are simply transformed into
an empty statement that does nothing.
The solution is that simple self-assignments that consist of
- Symbols: ``x = x``
- Field access: ``x.f = x.f``
- Array, sequence or string access with indices known at compile-time: ``x[0] = x[0]``
are transformed into an empty statement that does nothing.
The compiler is free to optimize further cases.
The complex case looks like a variant of ``x = f(x)``, we consider
``x = select(rand() < 0.5, x, y)`` here: