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Fix #2979: Allow for instantiated params when approximating #3826

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Merged
merged 1 commit into from
Jan 15, 2018
Merged

Fix #2979: Allow for instantiated params when approximating #3826

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18 changes: 9 additions & 9 deletions compiler/src/dotty/tools/dotc/core/ConstraintHandling.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -227,15 +227,15 @@ trait ConstraintHandling {
}
}
}
if (constraint.contains(param)) {
val bound = if (fromBelow) constraint.fullLowerBound(param) else constraint.fullUpperBound(param)
val inst = avoidParam(bound)
typr.println(s"approx ${param.show}, from below = $fromBelow, bound = ${bound.show}, inst = ${inst.show}")
inst
}
else {
assert(ctx.mode.is(Mode.Interactive))
UnspecifiedErrorType
constraint.entry(param) match {
case _: TypeBounds =>
val bound = if (fromBelow) constraint.fullLowerBound(param) else constraint.fullUpperBound(param)
val inst = avoidParam(bound)
typr.println(s"approx ${param.show}, from below = $fromBelow, bound = ${bound.show}, inst = ${inst.show}")
inst
case inst =>
assert(inst.exists, i"param = $param\n constraint = $constraint")
inst
}
}

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6 changes: 6 additions & 0 deletions tests/neg/i2979.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,6 @@
object Main {
Map(
"a" -> Unknown(), // error
"b" -> Unknown() // error
)
}