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Backport "Consistently use TypeMismatch in TreeChecker" to LTS #22119

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Dec 4, 2024
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Backport "Consistently use TypeMismatch in TreeChecker" to LTS #22119

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48 changes: 17 additions & 31 deletions compiler/src/dotty/tools/dotc/transform/TreeChecker.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -397,19 +397,8 @@ object TreeChecker {
promote(tree)
case _ =>
val tree1 = super.typedUnadapted(tree, pt, locked)
def isSubType(tp1: Type, tp2: Type) =
(tp1 eq tp2) || // accept NoType / NoType
(tp1 <:< tp2)
def divergenceMsg(tp1: Type, tp2: Type) =
s"""Types differ
|Original type : ${tree.typeOpt.show}
|After checking: ${tree1.tpe.show}
|Original tree : ${tree.show}
|After checking: ${tree1.show}
|Why different :
""".stripMargin + core.TypeComparer.explained(_.isSubType(tp1, tp2))
if (tree.hasType) // it might not be typed because Typer sometimes constructs new untyped trees and resubmits them to typedUnadapted
assert(isSubType(tree1.tpe, tree.typeOpt), divergenceMsg(tree1.tpe, tree.typeOpt))
if tree.hasType then // it might not be typed because Typer sometimes constructs new untyped trees and resubmits them to typedUnadapted
checkType(tree1.tpe, tree.typeOpt, tree, "typedUnadapted")
tree1
checkNoOrphans(res.tpe)
phasesToCheck.foreach(_.checkPostCondition(res))
Expand Down Expand Up @@ -747,28 +736,25 @@ object TreeChecker {
override def adapt(tree: Tree, pt: Type, locked: TypeVars)(using Context): Tree = {
def isPrimaryConstructorReturn =
ctx.owner.isPrimaryConstructor && pt.isRef(ctx.owner.owner) && tree.tpe.isRef(defn.UnitClass)
def infoStr(tp: Type) = tp match {
case tp: TypeRef =>
val sym = tp.symbol
i"${sym.showLocated} with ${tp.designator}, flags = ${sym.flagsString}, underlying = ${tp.underlyingIterator.toList}%, %"
case _ =>
"??"
}
if (ctx.mode.isExpr &&
!tree.isEmpty &&
!isPrimaryConstructorReturn &&
!pt.isInstanceOf[FunOrPolyProto])
assert(tree.tpe <:< pt, {
val mismatch = TypeMismatch(tree.tpe, pt, Some(tree))
i"""|${mismatch.msg}
|found: ${infoStr(tree.tpe)}
|expected: ${infoStr(pt)}
|tree = $tree""".stripMargin
})
if ctx.mode.isExpr
&& !tree.isEmpty
&& !isPrimaryConstructorReturn
&& !pt.isInstanceOf[FunOrPolyProto]
then
checkType(tree.tpe, pt, tree, "adapt")
tree
}

override def simplify(tree: Tree, pt: Type, locked: TypeVars)(using Context): tree.type = tree

private def checkType(tp1: Type, tp2: Type, tree: untpd.Tree, step: String)(using Context) =
// Accept NoType <:< NoType as true
assert((tp1 eq tp2) || (tp1 <:< tp2), {
val mismatch = TypeMismatch(tp1, tp2, None)
i"""|Type Mismatch (while checking $step):
|${mismatch.message}${mismatch.explanation}
|tree = $tree ${tree.className}""".stripMargin
})
}

/** Tree checker that can be applied to a local tree. */
Expand Down
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