Replace convert by prefix ~ operator

Author: rjolly

library/src/scala/Conversion.scala

@@ -19,13 +19,13 @@ package scala
 *  from two to one.
 *
 *  The `Conversion` class can also be used to convert explicitly, using
-*  the `convert` extension method.
+*  the `~` operator.
 */
 @java.lang.FunctionalInterface
 abstract class Conversion[-T, +U] extends Function1[T, U]:
   /** Convert value `x` of type `T` to type `U` */
   def apply(x: T): U
 
   extension (x: T)
-    /** `x.convert` converts a value `x` of type `T` to type `U` */
-    def convert = this(x)
+    /** `~x` converts a value `x` of type `T` to type `U` */
+    def unary_~ = this(x)

tests/pos/convert.scala

@@ -4,6 +4,6 @@ given Conversion[String, Int] = _.length
 given Conversion[Int, String] = _.toString
 given Conversion[Int, Date] = new Date(_)
 
-def f(x: String): Int = x.convert
-def g(x: Int): String = x.convert
-def h(x: Int): Date = x.convert
+def f(x: String): Int = ~x
+def g(x: Int): String = ~x
+def h(x: Int): Date = ~x