Library /sys$common/syshlp/basichelp.hlb Compile time errors, EOLNOTERR  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  ERROR - A THEN or ELSE clause contains a loop block, and a line number
  terminates  the  IF-THEN-ELSE  before the end of the loop block.  Make
  sure that any loop is entirely contained in the THEN or ELSE clause.