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Add optional recursive arg to distinctBase (v2) (#18659)

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* Add optional recursive arg to distinctBase
* Add docs and examples

Co-authored-by: ALANVF <alan.invents@gmail.com>
This commit is contained in:
Timothee Cour 2021-08-08 23:51:39 -07:00 • committed by GitHub
commit 8ce782d463
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4 changed files with 18 additions and 10 deletions
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compiler/semmagic.nim
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@ -190,9 +190,10 @@ proc evalTypeTrait(c: PContext; traitCall: PNode, operand: PType, context: PSym)
result = newIntNodeT(toInt128(operand.len), traitCall, c.idgen, c.graph)
of "distinctBase":
var arg = operand.skipTypes({tyGenericInst})
let rec = semConstExpr(c, traitCall[2]).intVal != 0
while arg.kind == tyDistinct:
arg = arg.base
arg = arg.skipTypes(skippedTypes + {tyGenericInst})
arg = arg.base.skipTypes(skippedTypes + {tyGenericInst})
if not rec: break
result = getTypeDescNode(c, arg, operand.owner, traitCall.info)
else:
localError(c.config, traitCall.info, "unknown trait: " & s)