This probably has to do with LLVM's parser. Anyways, structures don't persist for more than one iteration of the REPL. Structure names, for some reason, get named %<structure name>.<natural number>. Use llc with the C++ backend to view the LLVM API code required to generate structures and implement that.

Which platforms is this expected to compile/run on? I get the following when trying to compile on OSX:

--- Downloads/Hylas-Lisp ‹master› » make
# Compile the helper Hylas<->LLVM interface
`(which clang++; which g++) | head -n 1` src/jit.cpp -o libhylas.o -c -fPIC -Wall -Wextra -Werror  -std=c++0x -    D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS
src/jit.cpp:5:10: fatal error: 'thread' file not found
#include <thread>
         ^
1 error generated.
make: *** [backend] Error 1

from README.md:

This project is being rewritten. Please check back in a few megaseconds.

But, it has been almost 50 megaseconds since the last commit. Bug!

Hello I got the following message when I tried to build Hylas. My system is Ubuntu 13.04 64bit and I built my own LLVM 3.3 binaries.

Compile the helper Hylas<->LLVM interface

(which clang++; which g++) | head -n 1 src/jit.cpp -o libhylas.o -c -fPIC -Wall -Wextra -Werror -std=c++0x -D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS
src/jit.cpp:87:20: error: reference to 'error_code' is ambiguous
return error_code("ERROR: Couldn't find program entry point.");
^
src/jit.cpp:48:11: note: candidate found by name lookup is 'error_code'
Code* error_code(const char* desc) {
^
/usr/local/include/llvm/Support/system_error.h:726:7: note: candidate found by
name lookup is 'llvm::error_code'
class error_code {
^
src/jit.cpp:87:20: error: no matching conversion for functional-style cast from
'const char [42]' to 'llvm::error_code'
return error_code("ERROR: Couldn't find program entry point.");
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/local/include/llvm/Support/system_error.h:726:7: note: candidate
constructor (the implicit copy constructor) not viable: no known
conversion from 'const char [42]' to 'const llvm::error_code' for 1st
argument
class error_code {
^
/usr/local/include/llvm/Support/system_error.h:726:7: note: candidate
constructor (the implicit move constructor) not viable: no known
conversion from 'const char [42]' to 'llvm::error_code' for 1st argument
class error_code {
^
/usr/local/include/llvm/Support/system_error.h:740:3: note: candidate template
ignored: substitution failure [with E = const char _]: no type named
'type' in 'llvm::enable_if_c<false, void>'
error_code(E _e, typename enable_if_c<
^
/usr/local/include/llvm/Support/system_error.h:730:3: note: candidate
constructor not viable: requires 0 arguments, but 1 was provided
error_code() : val(0), cat(&system_category()) {}
^
/usr/local/include/llvm/Support/system_error.h:736:3: note: candidate
constructor not viable: requires 2 arguments, but 1 was provided
error_code(int _val, const error_category& cat)
^
src/jit.cpp:91:20: error: reference to 'error_code' is ambiguous
return error_code(errors.getMessage().data());
^
src/jit.cpp:48:11: note: candidate found by name lookup is 'error_code'
Code error_code(const char* desc) {
^
/usr/local/include/llvm/Support/system_error.h:726:7: note: candidate found by
name lookup is 'llvm::error_code'
class error_code {
^
src/jit.cpp:91:20: error: no matching conversion for functional-style cast from
'const char _' to 'llvm::error_code'
return error_code(errors.getMessage().data());
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/local/include/llvm/Support/system_error.h:726:7: note: candidate
constructor (the implicit copy constructor) not viable: no known
conversion from 'const char *' to 'const llvm::error_code' for 1st
argument
class error_code {
^
/usr/local/include/llvm/Support/system_error.h:726:7: note: candidate
constructor (the implicit move constructor) not viable: no known
conversion from 'const char *' to 'llvm::error_code' for 1st argument
class error_code {
^
/usr/local/include/llvm/Support/system_error.h:740:3: note: candidate template
ignored: substitution failure [with E = const char *]: no type named
'type' in 'llvm::enable_if_c<false, void>'
error_code(E _e, typename enable_if_c<
^
/usr/local/include/llvm/Support/system_error.h:730:3: note: candidate
constructor not viable: requires 0 arguments, but 1 was provided
error_code() : val(0), cat(&system_category()) {}
^
/usr/local/include/llvm/Support/system_error.h:736:3: note: candidate
constructor not viable: requires 2 arguments, but 1 was provided
error_code(int _val, const error_category& cat)
^
src/jit.cpp:95:20: error: reference to 'error_code' is ambiguous
return error_code(parser_errors.data());
^
src/jit.cpp:48:11: note: candidate found by name lookup is 'error_code'
Code error_code(const char* desc) {
^
/usr/local/include/llvm/Support/system_error.h:726:7: note: candidate found by
name lookup is 'llvm::error_code'
class error_code {
^
src/jit.cpp:95:20: error: no matching conversion for functional-style cast from
'const char _' to 'llvm::error_code'
return error_code(parser_errors.data());
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/local/include/llvm/Support/system_error.h:726:7: note: candidate
constructor (the implicit copy constructor) not viable: no known
conversion from 'const char *' to 'const llvm::error_code' for 1st
argument
class error_code {
^
/usr/local/include/llvm/Support/system_error.h:726:7: note: candidate
constructor (the implicit move constructor) not viable: no known
conversion from 'const char *' to 'llvm::error_code' for 1st argument
class error_code {
^
/usr/local/include/llvm/Support/system_error.h:740:3: note: candidate template
ignored: substitution failure [with E = const char *]: no type named
'type' in 'llvm::enable_if_c<false, void>'
error_code(E _e, typename enable_if_c<
^
/usr/local/include/llvm/Support/system_error.h:730:3: note: candidate
constructor not viable: requires 0 arguments, but 1 was provided
error_code() : val(0), cat(&system_category()) {}
^
/usr/local/include/llvm/Support/system_error.h:736:3: note: candidate
constructor not viable: requires 2 arguments, but 1 was provided
error_code(int _val, const error_category& cat)
^
6 errors generated.
make: ** [backend] Error 1