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Backport "Disallow taking singleton types of packages again" #18330

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merged 1 commit into from
Aug 9, 2023
Merged

Backport "Disallow taking singleton types of packages again" #18330

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13 changes: 8 additions & 5 deletions compiler/src/dotty/tools/dotc/typer/Checking.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -748,13 +748,16 @@ object Checking {
if sym.isNoValue && !ctx.isJava then
report.error(JavaSymbolIsNotAValue(sym), tree.srcPos)

/** Check that `tree` refers to a value, unless `tree` is selected or applied
* (singleton types x.type don't count as selections).
*/
def checkValue(tree: Tree, proto: Type)(using Context): tree.type =
tree match
case tree: RefTree
if tree.name.isTermName
&& !proto.isInstanceOf[SelectionProto]
&& !proto.isInstanceOf[FunOrPolyProto] =>
checkValue(tree)
case tree: RefTree if tree.name.isTermName =>
proto match
case _: SelectionProto if proto ne SingletonTypeProto => // no value check
case _: FunOrPolyProto => // no value check
case _ => checkValue(tree)
case _ =>
tree

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11 changes: 11 additions & 0 deletions tests/neg/i18109.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,11 @@
package foo {}

package bar {
object Test {
def qux[A] = 123
def main(args: Array[String]): Unit = {
val y = qux[foo.type] // error
val x = valueOf[foo.type] // error
}
}
}