calling sys.exit causes a segfault

[dylon]

Calling sys.exit with any value causes a segfault in lpython 0.13.0:

$ cat main.py
import sys
sys.exit(0)

$ lpython --show-c main.py
[1]    3803544 segmentation fault (core dumped)  lpython --show-c main.py

$ lpython --version
LPython version: 0.13.0
Platform: Linux
Default target: x86_64-unknown-linux-gnu

If I comment-out the call to sys.exit, lpython works as expected.

[Smit-create]

On the current main branch:

Internal Compiler Error: Unhandled exception
Traceback (most recent call last):
  File "/Users/thebigbool/repos/lpython/src/bin/lpython.cpp", line 1739
    return emit_c(arg_file, runtime_library_dir, lpython_pass_manager,
  File "/Users/thebigbool/repos/lpython/src/bin/lpython.cpp", line 329
    r1 = LCompilers::LPython::python_ast_to_asr(al, lm, *ast, diagnostics, compiler_options, true, infile);
  File "/Users/thebigbool/repos/lpython/src/lpython/semantics/python_ast_to_asr.cpp", line 7009
    if (res2.ok) {
  File "/Users/thebigbool/repos/lpython/src/lpython/semantics/python_ast_to_asr.cpp", line 6960
    b.visit_Module(ast);
  File "/Users/thebigbool/repos/lpython/src/lpython/semantics/python_ast_to_asr.cpp", line 4195
    visit_stmt(*x.m_body[i]);
  File "/Users/thebigbool/repos/lpython/src/lpython/python_ast.h", line 1883
    void visit_stmt(const stmt_t &b) { visit_stmt_t(b, self()); }
  File "/Users/thebigbool/repos/lpython/src/lpython/python_ast.h", line 1773
    case stmtType::Expr: { v.visit_Expr((const Expr_t &)x); return; }
  File "/Users/thebigbool/repos/lpython/src/lpython/semantics/python_ast_to_asr.cpp", line 5911
    handle_attribute(te, at->m_attr, x.base.base.loc, elements);
  File "/Users/thebigbool/repos/lpython/src/lpython/semantics/python_ast_to_asr.cpp", line 677
    tmp = attr_handler.get_attribute(s, attr_name, al, loc, args, diag);
  File "/Users/thebigbool/repos/lpython/src/lpython/semantics/python_attribute_eval.h", line 56
    ASR::ttype_t *type = ASRUtils::expr_type(e);
  File "/Users/thebigbool/repos/lpython/src/libasr/asr_utils.h", line 110
    return ASR::expr_type0(f);
  File "/Users/thebigbool/repos/lpython/src/libasr/asr.h", line 45492
    return ASR::down_cast<ASR::Variable_t>(s)->m_type;
  File "/Users/thebigbool/repos/lpython/src/libasr/asr.h", line 41
    LCOMPILERS_ASSERT(is_a<T>(*f));
AssertFailed: is_a<T>(*f)