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Improve implicit parameter error message with aliases #17125

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Mar 28, 2023
Merged

Improve implicit parameter error message with aliases #17125

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2 changes: 1 addition & 1 deletion compiler/src/dotty/tools/dotc/typer/Implicits.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -969,7 +969,7 @@ trait Implicits:
case Select(qual, nme.apply) if defn.isFunctionType(qual.tpe.widen) =>
val qt = qual.tpe.widen
val qt1 = qt.dealiasKeepAnnots
def addendum = if (qt1 eq qt) "" else (i"\nThe required type is an alias of: $qt1")
def addendum = if (qt1 eq qt) "" else (i"\nWhere $qt is an alias of: $qt1")
i"parameter of ${qual.tpe.widen}$addendum"
case _ =>
i"${ if paramName.is(EvidenceParamName) then "an implicit parameter"
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5 changes: 5 additions & 0 deletions tests/neg/i17122.check
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@@ -0,0 +1,5 @@
-- [E172] Type Error: tests/neg/i17122.scala:7:14 ----------------------------------------------------------------------
7 |def test = m() // error
| ^
| No given instance of type A was found for parameter of C
| Where C is an alias of: (A) ?=> B
7 changes: 7 additions & 0 deletions tests/neg/i17122.scala
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@@ -0,0 +1,7 @@
case class A()
case class B()

type C = A ?=> B
def m(): C = ???

def test = m() // error