org.wartremover.warts.MapUnit.scala Maven / Gradle / Ivy
package org.wartremover
package warts
object MapUnit extends WartTraverser {
def apply(u: WartUniverse): u.Traverser = {
import u.universe._
val iterable = rootMirror.staticClass("scala.collection.Iterable").toTypeConstructor
new Traverser {
override def traverse(tree: Tree): Unit = {
tree match {
case t if hasWartAnnotation(u)(t) =>
case Apply(
Apply(
TypeApply(Select(qualifier, TermName("map")), _ :: _ :: Nil),
f :: Nil
),
canBuildFrom :: Nil
) if (qualifier.tpe.typeConstructor <:< iterable) && f.tpe.typeArgs.lift(1).exists(_ =:= typeOf[Unit]) =>
error(u)(tree.pos, "Maybe you should use `foreach` instead of `map`")
super.traverse(tree)
case _ =>
super.traverse(tree)
}
}
}
}
}