74568641cd
LET/LET* were allowed to lexically and dynamically bind constants in
the bytecode compiler and interpreter:
> (let ((pi 3)) pi)
3
> (progn (defconstant +c+ 'foo) (let ((+c+ 'bar)) +c+))
BAR
> (flet ((hello () (format t "hi")))
(let ((t nil))
(declare (special t))
; Oops, now this returns a string
(hello)))
"hi"
Plus plenty of other ways to wreak havoc on unsuspecting code.
CLHS says the behavior is undefined when attempting to bind or assign
constant variables (CLHS 3.1.2.1.1.3 and the entry for defconstant).
(Well, CLHS 3.4.1 explicitly says that constant variables cannot be
used for variables in lambda lists.)
The C-compiler gives errors for these sorts of things, and the bytecode
compiler and interpreter gives errors when attempting to bind or assign
constant variables in lambda expressions, SETQ and various other forms.
So the behavior above in LET is inconsistent with both the C-compiler
and other parts of the bytecode compiler and interpreter.
Now give an error when attempting to bind a constant variable in
LET/LET* in the bytecode compiler and interpreter.
This also changes the behavior of PROG/PROG* and DESTRUCTURING-BIND so
that they give errors when attempting to bind constants as well.
|
||
|---|---|---|
| contrib | ||
| doc | ||
| examples | ||
| msvc | ||
| src | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| appveyor.yml | ||
| CHANGELOG | ||
| configure | ||
| COPYING | ||
| INSTALL | ||
| LICENSE | ||
| Makefile.in | ||
| README.md | ||
ECL stands for Embeddable Common-Lisp. The ECL project aims to produce an implementation of the Common-Lisp language which complies to the ANSI X3J13 definition of the language.
The term embeddable refers to the fact that ECL includes a Lisp to C compiler, which produces libraries (static or dynamic) that can be called from C programs. Furthermore, ECL can produce standalone executables from Lisp code and can itself be linked to your programs as a shared library. It also features an interpreter for situations when a C compiler isn't available.
ECL supports the operating systems Linux, FreeBSD, NetBSD, DragonFly BSD, OpenBSD, Solaris (at least v. 9), Microsoft Windows (MSVC, MinGW and Cygwin) and OSX, running on top of the Intel, Sparc, Alpha, ARM and PowerPC processors. Porting to other architectures should be rather easy.