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Make MatchResult Showable #15930

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Sep 3, 2022
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Make MatchResult Showable #15930

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11 changes: 9 additions & 2 deletions compiler/src/dotty/tools/dotc/core/TypeComparer.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -2907,12 +2907,19 @@ object TypeComparer {
}

object TrackingTypeComparer:
enum MatchResult:
import printing.*, Texts.*
enum MatchResult extends Showable:
case Reduced(tp: Type)
case Disjoint
case Stuck
case NoInstance(fails: List[(Name, TypeBounds)])

def toText(p: Printer): Text = this match
case Reduced(tp) => "Reduced(" ~ p.toText(tp) ~ ")"
case Disjoint => "Disjoint"
case Stuck => "Stuck"
case NoInstance(fails) => "NoInstance(" ~ Text(fails.map(p.toText(_) ~ p.toText(_)), ", ") ~ ")"

class TrackingTypeComparer(initctx: Context) extends TypeComparer(initctx) {
import TrackingTypeComparer.*

Expand Down Expand Up @@ -2976,7 +2983,7 @@ class TrackingTypeComparer(initctx: Context) extends TypeComparer(initctx) {
}

/** Match a single case. */
def matchCase(cas: Type): MatchResult = trace(i"match case $cas vs $scrut", matchTypes) {
def matchCase(cas: Type): MatchResult = trace(i"$scrut match ${MatchTypeTrace.caseText(cas)}", matchTypes, show = true) {
val cas1 = cas match {
case cas: HKTypeLambda =>
caseLambda = constrained(cas)
Expand Down