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Update Types.scala #24761

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Update Types.scala #24761

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12 changes: 9 additions & 3 deletions compiler/src/dotty/tools/dotc/core/Types.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -6796,13 +6796,19 @@ object Types extends TypeUtils {
// non-range arguments L1, ..., Ln and H1, ..., Hn such that
// C[L1, ..., Ln] <: C[H1, ..., Hn] by taking the right limits of
// ranges that appear in as co- or contravariant arguments.
// Fail for non-variant argument ranges (see use-site else branch below).
// If successful, the L-arguments are in loBut, the H-arguments in hiBuf.
// Fail for non-trivial non-variant argument ranges (see use-site else branch below).
// If successful, the L-arguments are in loBuf, the H-arguments in hiBuf.
// @return operation succeeded for all arguments.
def distributeArgs(args: List[Type], tparams: List[ParamInfo]): Boolean = args match {
case Range(lo, hi) :: args1 =>
val v = tparams.head.paramVarianceSign
if (v == 0) false
if (v == 0) {
if (lo == hi) {
loBuf += lo; hiBuf += hi
distributeArgs(args1, tparams.tail)
}
else false
}
else {
if (v > 0) { loBuf += lo; hiBuf += hi }
else { loBuf += hi; hiBuf += lo }
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