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Manual cast required to preserve dependent types #12345

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@japgolly

Description

@japgolly

Compiler version

3.0.0-RC3

Minimized code

import scala.quoted.*

object C:
  def hack(using qq: Quotes): C { val q: qq.type } =
    (new C).asInstanceOf[C { val q: qq.type }] // shouldn't be necessary

class C(using val q: Quotes):
  val flags = q.reflect.Flags.Lazy

def test(using q: Quotes) =
  import q.reflect.*

  val c = new C
  c.flags : Flags

  val d = C.hack
  d.flags : Flags

Output

[error] 14 |  c.flags : Flags
[error]    |  ^^^^^^^
[error]    |  Found:    (c.flags : c.q.reflect.Flags)
[error]    |  Required: q².reflect.Flags
[error]    |
[error]    |  where:    q  is a given instance in class C
[error]    |            q² is a parameter in method test
[error] one error found

Expectation

It should compile.

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