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31 lines
999 B
Nim
31 lines
999 B
Nim
type
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Matrix*[M, N: static[int], T: SomeReal] = object
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data: ref array[N * M, T]
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Matrix64*[M, N: static[int]] = Matrix[M, N, float64]
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proc zeros64(M,N: static[int]): Matrix64[M,N] =
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new result.data
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for i in 0 .. < (M * N):
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result.data[i] = 0'f64
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proc bar*[M,N: static[int], T](a: Matrix[M,N,T], b: Matrix[M,N,T]) =
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discard
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let a = zeros64(2,2)
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bar(a,a)
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# https://github.com/nim-lang/Nim/issues/5643
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#
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# The test case was failing here, because the compiler failed to
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# detect the two matrix instantiations as the same type.
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#
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# The root cause was that the `T` type variable is a different
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# type after the first Matrix type has been matched.
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#
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# Sigmatch was failing to match the second version of `T`, but
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# due to some complex interplay between tyOr, tyTypeDesc and
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# tyGenericParam this was allowed to went through. The generic
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# instantiation of the second matrix was incomplete and the
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# generic cache lookup failed, producing two separate types.
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