2.6. Sharpsign [sec_2-4-8]

2.6.1. Sharpsign Backslash sec_2-4-8-1
2.6.2. Sharpsign Less-Than-Sign sec_2-4-8-20

Reader macros are also defined for the following:

Additional reader macros

#,
load-time evaluation, kept despite the [ANSI CL standard] issue SHARP-COMMA-CONFUSION:REMOVE.
#Y
compiled FUNCTION objects and input STREAM's EXT:ENCODINGs
#""
PATHNAME: #"test.lisp" is the value of (PATHNAME "test.lisp")

2.6.1. Sharpsign Backslash [sec_2-4-8-1]

#\Code allows input of characters of arbitrary code: e.g., #\Code231 reads as the character (CODE-CHAR 231).

2.6.2. Sharpsign Less-Than-Sign [sec_2-4-8-20]

This is the list of objects whose external representation cannot be meaningfully read in:

Unreadable objects

#<type ...>
all STRUCTURE-OBJECTs lacking a keyword constructor
#<ARRAY type dimensions>
all ARRAYs except STRINGs, if *PRINT-ARRAY* is NIL
#<SYSTEM-FUNCTION name>
built-in function written in C
#<ADD-ON-SYSTEM-FUNCTION name>
module function written in C
#<SPECIAL-OPERATOR name>
special operator handler
#<COMPILED-FUNCTION name>
compiled function, if CUSTOM:*PRINT-CLOSURE* is NIL
#<FUNCTION name ...>
interpreted function, , if CUSTOM:*PRINT-CLOSURE* is NIL
#<FRAME-POINTER #x...>
pointer to a stack frame
#<DISABLED POINTER>
frame pointer which has become invalid on exit from the corresponding BLOCK or TAGBODY
#<...STREAM...>
STREAM
#<PACKAGE name>
PACKAGE
#<HASH-TABLE #x...>
HASH-TABLE, if *PRINT-ARRAY* is NIL
#<READTABLE #x...>
READTABLE
#<SYMBOL-MACRO form>
SYMBOL-MACRO handler
#<MACRO function>
macro expander (defined by DEFMACRO and friends)
#<FFI:FOREIGN-POINTER #x...>
foreign pointer (Platform Dependent: UNIX, Win32 platforms only.)
#<FFI:FOREIGN-ADDRESS #x...>
foreign address (Platform Dependent: UNIX, Win32 platforms only.)
#<FFI:FOREIGN-VARIABLE name #x...>
foreign variable (Platform Dependent: UNIX, Win32 platforms only.)
#<FFI:FOREIGN-FUNCTION name #x...>
foreign function (Platform Dependent: UNIX, Win32 platforms only.)
#<UNBOUND>
value of an unbound symbol, an unsupplied optional or keyword argument
#<SPECIAL REFERENCE>
environment marker for variables declared SPECIAL
#<DOT>
internal READ result for .
#<END OF FILE>
internal READ result, when the end-of-stream is reached
#<READ-LABEL ...>
intermediate READ result for #n#
#<ADDRESS #x...>
machine address, should not occur
#<SYSTEM-POINTER #x...>
should not occur

These notes document CLISP version 2.49+Last modified: 2016-09-05