Tests/RunCMake/GeneratorExpression/BoundOperand1OutsideBinding.cmake - third_party/github.com/Kitware/CMake - Git at Google

 # $<_1> requires a binary binding (e.g. SORT COMPARATOR); using it in a unary
 # APPLY body, which binds only $<_0>, is an error.
 file(GENERATE OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/x.txt"
   CONTENT "$<LIST:TRANSFORM,a;b,APPLY,X$<_1>Y>")
	# $<_1> requires a binary binding (e.g. SORT COMPARATOR); using it in a unary
	# APPLY body, which binds only $<_0>, is an error.
	file(GENERATE OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/x.txt"
	CONTENT "$<LIST:TRANSFORM,a;b,APPLY,X$<_1>Y>")