Dealias for unused param check #23256
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tgodzik
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May 30, 2025
| @@ -10,7 +10,7 @@ object circelike { | |||
| type Configuration | |||
| trait ConfiguredCodec[T] | |||
| object ConfiguredCodec: | |||
| inline final def derived[A](using conf: Configuration)(using inline mirror: Mirror.Of[A]): ConfiguredCodec[A] = // warn // warn | |||
| inline final def derived[A](using conf: Configuration)(using inline mirror: Mirror.Of[A]): ConfiguredCodec[A] = | |||
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These warning seemed valid, neither mirror nor conf is actually used.
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Is that a consequence of In addition, take an abstract type as not warnable, unless it has an upper bound that is warnable (has non-universal members). ?
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Yes, Mirror doesn't have terms to use. Also Of is an alias so warned previously.
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Tweaked to use |
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Fixes #23250
The check for "unused implicit parameter" considers the type of the parameter, but it should dealias first.
In addition, take an abstract type as not warnable, unless it has an upper bound that is warnable (has non-universal members).
Note that
isSingletondealiases.There was an ancient (OG) typo of
&for&&which has gone unfixed despite other edits. The right operand was always just an instanceof. Not sure if the previous idiom saves an opcode, but now it looks like other code nearby.