Add missing implicit keyword

Author: nicolasstucki

library/src/scala/tasty/util/ShowSourceCode.scala

@@ -66,6 +66,7 @@ class ShowSourceCode[T <: Tasty with Singleton](tasty0: T) extends Show[T](tasty
 
       case cdef @ ClassDef(name, DefDef(_, targs, argss, _, _), parents, self, stats) =>
         val flags = cdef.flags
+        if (flags.isImplicit) this += "implicit "
         if (flags.isFinal && !flags.isObject) this += "final "
         if (flags.isCase) this += "case "
 
@@ -152,6 +153,7 @@ class ShowSourceCode[T <: Tasty with Singleton](tasty0: T) extends Show[T](tasty
 
       case vdef@ValDef(name, tpt, rhs) =>
         val flags = vdef.flags
+        if (flags.isImplicit) this += "implicit "
         if (flags.isOverride) this += "override "
 
         if (flags.isLazy) this += "lazy "
@@ -203,7 +205,8 @@ class ShowSourceCode[T <: Tasty with Singleton](tasty0: T) extends Show[T](tasty
 
       case ddef@DefDef(name, targs, argss, tpt, rhs) =>
         val flags = ddef.flags
-        if (flags.isOverride) sb.append("override ")
+        if (flags.isImplicit) this += "implicit "
+        if (flags.isOverride) this += "override "
 
         this += "def " += name
         printTargsDefs(targs)