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Better error message for arity mismatch #17955

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Better error message for arity mismatch #17955

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8 changes: 5 additions & 3 deletions compiler/src/dotty/tools/dotc/reporting/messages.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -1739,10 +1739,12 @@ class NotAPath(tp: Type, usage: String)(using Context) extends TypeMsg(NotAPathI
| - a reference to `this`, or
| - a selection of an immutable path with an immutable value."""

class WrongNumberOfParameters(expected: Int)(using Context)
class WrongNumberOfParameters(expected: Int, found: Int, pt: Type, tree: tpd.Tree)(using Context)
extends SyntaxMsg(WrongNumberOfParametersID) {
def msg(using Context) = s"Wrong number of parameters, expected: $expected"
def explain(using Context) = ""
def msg(using Context) = s"Wrong number of parameters, expected $expected, but found $found"
def explain(using Context) =
i"""|Expected pattern: $pt
|Found pattern : ${tree.srcPos}"""
}

class DuplicatePrivateProtectedQualifier()(using Context)
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2 changes: 1 addition & 1 deletion compiler/src/dotty/tools/dotc/typer/Typer.scala
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Expand Up @@ -1569,7 +1569,7 @@ class Typer(@constructorOnly nestingLevel: Int = 0) extends Namer
/** Returns the type and whether the parameter is erased */
def protoFormal(i: Int): (Type, Boolean) =
if (protoFormals.length == params.length) (protoFormals(i), isDefinedErased(i))
else (errorType(WrongNumberOfParameters(protoFormals.length), tree.srcPos), false)
else (errorType(WrongNumberOfParameters(protoFormals.length, params.length, pt, tree), tree.srcPos), false)

/** Is `formal` a product type which is elementwise compatible with `params`? */
def ptIsCorrectProduct(formal: Type) =
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