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7e1ae35195
* testament: error instead of silently ignore invalid targets * s/target/targets/ * fix test; refs #16344 * address comments * Update testament/specs.nim Co-authored-by: Andreas Rumpf <rumpf_a@web.de>
25 lines
640 B
Nim
25 lines
640 B
Nim
discard """
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action: compile
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targets: "c"
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"""
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# Covariance is not type safe:
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# Note: `nim cpp` makes it a compile error (after codegen), even with:
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# `var f = cast[proc (x: var TA) {.nimcall.}](cast[pointer](bp))`, which
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# currently removes all the `cast` in cgen'd code, hence the compile error.
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type
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TA = object of RootObj
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a: int
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TB = object of TA
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b: array[0..5000_000, int]
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proc ap(x: var TA) = x.a = -1
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proc bp(x: var TB) = x.b[high(x.b)] = -1
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# in Nim proc (x: TB) is compatible to proc (x: TA),
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# but this is not type safe:
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var f = cast[proc (x: var TA) {.nimcall.}](bp)
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var a: TA
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f(a) # bp expects a TB, but gets a TA
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