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Fix recursive generic typed defs (#18809)

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This commit is contained in:
Jason Beetham
2021-09-06 01:43:26 -06:00
committed by GitHub
parent f373c17ad9
commit 7ae52d7791
2 changed files with 13 additions and 1 deletions
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2
compiler/semtypinst.nim
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@@ -378,7 +378,7 @@ proc handleGenericInvocation(cl: var TReplTypeVars, t: PType): PType =
cl.typeMap = newTypeMapLayer(cl)
for i in 1..<t.len:
var x = replaceTypeVarsT(cl, t[i])
var x = replaceTypeVarsT(cl, header[i])
assert x.kind != tyGenericInvocation
header[i] = x
propagateToOwner(header, x)

12
tests/generics/trecursivegenerics.nim Normal file
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@@ -0,0 +1,12 @@
block: # Replicates #18728
type
FlipFlop[A, B] = ref object
next: FlipFlop[B, A]
Trinary[A, B, C] = ref object
next: Trinary[B, C, A]
assert typeof(FlipFlop[int, string]().next) is FlipFlop[string, int]
assert typeof(FlipFlop[string, int]().next) is FlipFlop[int, string]
assert typeof(Trinary[int, float, string]().next) is Trinary[float, string, int]
assert typeof(Trinary[int, float, string]().next.next) is Trinary[string, int, float]