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da4aa2e1fb
* Assign hook name changed to `=copy` * Adapt destructors.rst * [nobackport] Duplicate tests for =copy hook * Fix tests * added a changelog entry Co-authored-by: Clyybber <darkmine956@gmail.com>
34 lines
700 B
Nim
34 lines
700 B
Nim
discard """
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errormsg: "'=copy' is not available for type <Foo>; requires a copy because it's not the last read of 'otherTree'"
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line: 29
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"""
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type
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Foo = object
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x: int
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proc `=destroy`(f: var Foo) = f.x = 0
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proc `=`(a: var Foo; b: Foo) {.error.} # = a.x = b.x
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proc `=sink`(a: var Foo; b: Foo) = a.x = b.x
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proc createTree(x: int): Foo =
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Foo(x: x)
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proc take2(a, b: sink Foo) =
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echo a.x, " ", b.x
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proc allowThis() =
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# all these temporary lets are harmless:
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let otherTree = createTree(44)
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let b = otherTree
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let c = b
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take2(createTree(34), c)
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proc preventThis() =
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let otherTree = createTree(44)
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let b = otherTree
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take2(createTree(34), otherTree)
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allowThis()
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preventThis()
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