Language restricted

Except where indicated, the compiler will flag the use of any language that is restricted.

RECORD I/O
RECORD I/O is supported but with restrictions.
STREAM I/O
STREAM I/O is supported but with restrictions that apply to PUT/GET DATA statements.
Structure expressions
Structure expressions as arguments are not supported unless there is a parameter description that specifies all constant extents.
Array expressions
An array expression is not allowed as an argument to a user function unless it is an array of scalars of known size. Consequently, any array of scalars of arithmetic type can be passed to a user function, but there might be problems with arrays of varying-length strings.
DEFAULT statement
Factored default specifications are not supported.
Extents of automatic variables
An extent of an automatic variable cannot be set by a function nested in the procedure where the automatic variable is declared, or by an entry variable unless the entry variable is declared before the automatic variable.
Built-in functions
Some built-in functions are supported with exceptions and restrictions.
DEFINED BIT aggregates
If a DEFINED variable is a structure or union containing any elements that are UNALIGNED NONVARYING BIT, all array bounds and string lengths in the DEFINED variable must be specified as constants.
OPTIONS(REENTRANT)
This option is a part of the OPTIONS for a PROCEDURE or BEGIN statement, but it is ignored.
iSUB defining
Support for iSUB defining is limited to arrays of scalars.
LABEL arrays
The Enterprise PL/I compiler does not require that arrays of statement labels be declared.
DBCS
DBCS can be used only in G and M constants, identifiers, and comments.
GRAPHIC and POSITION
In OS PL/I, if a variable is declared with attributes GRAPHIC and POSITION, the POSITION value is interpreted as a count of bytes into the base variable. In Enterprise PL/I, the POSITION value is interpreted as a count of GRAPHIC characters into the base variable.
Macro preprocessor
Suffixes that follow string constants are not replaced by the macro preprocessor—whether or not these are legal PL/I suffixes—unless you insert a delimiter between the ending quotation mark of the string and the first letter of the suffix.

Parent topic: Understanding the limitations of the new compiler