EXSR or CASxx in a subroutine calls the same subroutine.
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Cause . . . . . : The operand of an EXSR operation or the Result-Field operand of a CASxx operation specifies the name of the subroutine in which the operation is performed. A subroutine cannot be called from an operation within the same subroutine. The specification is ignored.
Recovery . . . : Change the name of the subroutine on the operation or remove the operation. CABxx, GOTO, and TAG operations may be used to branch to a tag within the same subroutine. Compile again.
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