The output of the type built-in for a function containing a case control structure

The output of "type" for a function also reports the content of its body.
For this purpose, the internal data structures are parsed again and a readable body is regenerated.
However, particularly the output for a "case...esac" control structure is printed incorrectly in many versions.

The following call

  f() {
      case W in 
      X|Y|Z) : ;;
      *)     : ;;
      esac;
  }
  type f

usually generates the following output for the body:

    case WZ | Y | X):;;*):;;

Some implementations have been fixed, in different ways:

• On OSF1/V1.2 (SVR2), Ultrix 4.2 (but not yet Ultrix 3.1), AIX 1.2, ReliantUnix 5.42 and EP/IX 2.2.1AA, the output is

      case W in
      Z | Y | X): ;;
      *): ;;
      esac
  

• Version 8 output is slightly different (and type has been substituted by whatis):

      case W in
      Z|Y|X) : ;;
      *) : ;;
      esac
  

• On SunOS 4 the keyword "in" is still missing and commands are separated by newlines:

      case W
      Z | Y | X)
      : 
      ;;
      *)
      : 
      ;;
      esac 

  However, SunOS 5 in turn (at least until 5.10) hasn't been fixed.