SemanticDB is not being generated for extension methods

[kpodsiad]

Raised in scalameta/metals#5478, I've encountered this on my own as well when defining extension methods in companion object for trait.

Compiler version

3.3.1

Minimized code

//> using scala "3.3.1"

opaque type Deck = Long

object Deck {
  extension (data: Deck) {
    def fooSize: Int = ???
  }
}

// import Deck.* // uncomment and semanticDB will be properly generated
object DeckUsage {
  val deck: Deck = ???
  deck.fooSize
}

Output

Generated semanticDB file doesn't contain entries for fooSize usage in object DeckUsage

Expectation

Generated semanticDB file doesn't contain entries for fooSize usage in object DeckUsage, without need for an additional import

[Kordyjan]

@tanishiking can you take a look?

[tgodzik]

There is the same issue in the presentation compiler, which seems unrelated. Could it due to those extension methods being resolved at a later phase?

[tanishiking]

It seems like caused by the missing span for extension method
https://github.com/lampepfl/dotty/blob/a37dac66b1d48e8ac173dd4b2486b353f8574cc2/compiler/src/dotty/tools/dotc/semanticdb/ExtractSemanticDB.scala#L243 and it might be #18557 will help 👍 FYI @kasiaMarek

Confirmed it is fixed by #18557

[bishabosha]

fixed by #18557