Wrong error message when for ,) inside anonymous function or in flatMap/map/flapTap etc

[lemastero]

Observed incorrect behavior:

class WrongError extends App {
  def foo: () => Map[String, Double] = () =>
    Map(
      "age of star HD 140283" -> 14.46,
      "age of Universe" -> 13.8,
    )
}

produce an incorrect error message:

WrongError.scala: Expected token SEMI but got Token(ARROW,=>,119,=>)

Expected behavior:

provide proper error message sth like
WrongError.scala: Expected token SEMI but got Token(RPAREN,),119,))

In the following situation:

class WrongError extends App {
  Map(
    "age of star HD 140283" -> 14.46,
    "age of Universe" -> 13.8,
  )
}

gives WrongError.scala: illegal start of simple expression: Token(RPAREN,),155,)) that correctly state problem but no line number.

Severity:

Because there is no line number and the error message is misleading it is hard to find the issue

Version

"org.scalastyle" % "scalastyle_2.12" % "1.0.0"
Scala 2.12.10
sbt 1.3.5
used by: "org.scalastyle" %% "scalastyle-sbt-plugin" % "1.0.0"

Related:

• related: Parser error on f map[Option[Either[Throwable, T]]] #191 Scalastyle doesn't parse binary operators with type arguments #292
• line number issues: Lexical error message omits line number #187 Scalastyle failed without a line number #195 Scalastyle doesn't give line number in case of syntax error #319
• possible couse scala-ide/scalariform issue Parser error for infix methods with type parameter. scala-ide/scalariform#163