Deprecated inline method does not generate deprecation warning

[2m]

Compiler version

3.4.0, 3.4.1-RC1, 3.3.3.

Minimized code

Two deprecated methods, one inline.

//> using scala 3.4.0
//> using option -deprecation

object Deprecated:

  @deprecated("test")
  def method() = ???

  @deprecated("test")
  inline def inlineMethod() = ???

object Test:
  Deprecated.method()
  Deprecated.inlineMethod()

Output

Deprecation warning is not shown for the inline method.

[warn] ./depr.sc:13:3
[warn] method method in object Deprecated is deprecated: test
[warn]   Deprecated.method()
[warn]

Expectation

Both deprecated methods generate deprecation warnings. This was noticed in Iltotore/iron#229

[som-snytt]

fwiw this was too much machinery:

#16037

The suggestion there was to move CrossVersionChecks earlier. Unused check runs after typer.

Or maybe original is available to CrossVersionChecks via "inlined body retainer"; I don't remember how that works.

[nicolasstucki]

Moving CrossVersionChecks earlier would not help with transparent inline defs. We probably need to check those just before we inline the calls.