#2886 'set contourfill defined' causes an error with another keyword

[Hiroki Motoyoshi]

A keyword placed after the "defined" list in 'set contourfill' is rejected.

For example,

  set contourfill defined [-2:0] "blue", [0:2] "red" firstlinetype 5

shows the error message "Unrecognized option".

Probably related: inside a braced block

  if (1) {
    set contourfill defined [-2:2] "blue"
    print "foo"
  }

also shows same error message.

gnuplot 6.1 (last modified 2026-07-28), built from source.
macOS 15.6.1 (arm64).