strictEquality doesn't play well with inline given CanEqual

[road21]

Compiler version

3.3.4, 3.6.3

Minimized code

import scala.language.strictEquality

class Foo

object Foo:
  inline given CanEqual[Foo, Foo] = scala.compiletime.error("foo")

val x = new Foo
val y = new Foo

// summon[CanEqual[Foo, Foo]] // doesn't compile
x == y // compile, and this is strange

Expectation

x == y should not compile

https://scastie.scala-lang.org/D00uWxjoQiecE5zTo6vIZQ

[soronpo]

Duplicate of #13725

[som-snytt]

As a naive user, I agree the behavior is confusing, and I commented on the discussion.

#13728