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import language.experimental.macros
import reflect.macros.Context
object M {
def m(a: Any, b: Any): Any = macro mImpl
def mImpl(c: Context)(a: c.Expr[Any], b: c.Expr[Any]) = a
@reflect.macros.compileTimeOnly("cto may only be used as an argument to m")
def cto = 0
}
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