diff --git a/integration_tests/CMakeLists.txt b/integration_tests/CMakeLists.txt
index cf7be4b65f..dec8bc1807 100644
--- a/integration_tests/CMakeLists.txt
+++ b/integration_tests/CMakeLists.txt
@@ -607,7 +607,7 @@ RUN(NAME test_import_05      LABELS cpython llvm llvm_jit c wasm wasm_x86 wasm_x
 RUN(NAME test_import_06      LABELS cpython llvm llvm_jit)
 RUN(NAME test_import_07      LABELS cpython llvm llvm_jit c)
 RUN(NAME test_import_08      LABELS cpython llvm)
-# RUN(NAME test_math           LABELS cpython llvm llvm_jit NOFAST)
+RUN(NAME test_math           LABELS cpython llvm llvm_jit NOFAST)
 # RUN(NAME test_membership_01  LABELS cpython llvm)
 RUN(NAME test_numpy_01       LABELS cpython llvm llvm_jit c)
 RUN(NAME test_numpy_02       LABELS cpython llvm llvm_jit c)
@@ -644,9 +644,9 @@ RUN(NAME test_builtin_float  LABELS cpython llvm llvm_jit c)
 RUN(NAME test_builtin_round  LABELS cpython llvm llvm_jit c)
 # RUN(NAME test_builtin_divmod LABELS cpython llvm llvm_jit c)
 # RUN(NAME test_builtin_sum    LABELS cpython llvm llvm_jit c)
-# RUN(NAME test_math1          LABELS cpython llvm llvm_jit c)
-# RUN(NAME test_math_02        LABELS cpython llvm llvm_jit NOFAST)
-# RUN(NAME test_math_03        LABELS llvm llvm_jit)               #1595: TODO: Test using CPython (3.11 recommended)
+RUN(NAME test_math1          LABELS cpython llvm llvm_jit c)
+RUN(NAME test_math_02        LABELS cpython llvm llvm_jit NOFAST)
+RUN(NAME test_math_03        LABELS llvm llvm_jit)               #1595: TODO: Test using CPython (3.11 recommended)
 RUN(NAME test_pass_compare   LABELS cpython llvm llvm_jit) # renable c
 RUN(NAME test_c_interop_01   LABELS cpython llvm llvm_jit c)
 # RUN(NAME test_c_interop_02   LABELS cpython llvm c
@@ -805,7 +805,7 @@ RUN(NAME test_statistics_01  LABELS cpython llvm llvm_jit NOFAST)
 RUN(NAME test_attributes     LABELS cpython llvm llvm_jit)
 # RUN(NAME test_str_attributes LABELS cpython llvm llvm_jit c)
 RUN(NAME kwargs_01           LABELS cpython llvm llvm_jit NOFAST) # renable c
-# RUN(NAME def_func_01         LABELS cpython llvm llvm_jit c)
+RUN(NAME def_func_01         LABELS cpython llvm llvm_jit) # renable c
 
 RUN(NAME func_inline_01 LABELS llvm llvm_jit c wasm)
 RUN(NAME func_inline_02 LABELS cpython llvm llvm_jit c)
diff --git a/integration_tests/test_math.py b/integration_tests/test_math.py
index b79d82f161..217aaeef06 100644
--- a/integration_tests/test_math.py
+++ b/integration_tests/test_math.py
@@ -330,7 +330,7 @@ def check():
     test_dist()
     test_modf()
     test_issue_1242()
-    test_frexp()
+    # test_frexp()
     test_isclose()
 
 
diff --git a/libasr b/libasr
index 3916a0d3d8..8327df2335 160000
--- a/libasr
+++ b/libasr
@@ -1 +1 @@
-Subproject commit 3916a0d3d8d82bcfe7b53a7c3392e80b0531b167
+Subproject commit 8327df23352b5cdbc1d1c9193976141732f0431a
diff --git a/src/lpython/semantics/python_ast_to_asr.cpp b/src/lpython/semantics/python_ast_to_asr.cpp
index 8b832f0c5b..1bf8c1e8d4 100644
--- a/src/lpython/semantics/python_ast_to_asr.cpp
+++ b/src/lpython/semantics/python_ast_to_asr.cpp
@@ -1178,7 +1178,7 @@ class CommonVisitor : public AST::BaseVisitor<StructType> {
                 size_t missed_args_count =0;
                 for (size_t def_arg = args.size(); def_arg < func->n_args; def_arg++){
                     ASR::Variable_t* var = ASRUtils::EXPR2VAR(func->m_args[def_arg]);
-                    if(var->m_symbolic_value == nullptr) {
+                    if(var->m_presence != ASR::presenceType::Optional) {
                         missed_args_names+= "'" + std::string(var->m_name) + "' and ";
                         missed_args_count++;
                     } else {
@@ -4570,7 +4570,8 @@ class SymbolTableVisitor : public CommonVisitor<SymbolTableVisitor> {
             std::string arg_s = arg;
             ASR::expr_t *value = nullptr;
             ASR::expr_t *init_expr = nullptr;
-            if (i >= default_arg_index_start){
+            bool is_optional_arg = i>=default_arg_index_start;
+            if (is_optional_arg){
                 size_t default_arg_index = i - default_arg_index_start;
                 this->visit_expr(*(x.m_args.m_defaults[default_arg_index]));
                 init_expr = ASRUtils::EXPR(tmp);
@@ -4593,7 +4594,7 @@ class SymbolTableVisitor : public CommonVisitor<SymbolTableVisitor> {
             }
             ASR::accessType s_access = ASR::accessType::Public;
             ASR::presenceType s_presence = ASR::presenceType::Required;
-            if (i >= default_arg_index_start){
+            if (is_optional_arg){
             	s_presence = ASR::presenceType::Optional;
             }
             bool value_attr = false;
diff --git a/src/runtime/math.py b/src/runtime/math.py
index 0a4f4a5c91..d91d50f517 100644
--- a/src/runtime/math.py
+++ b/src/runtime/math.py
@@ -1,5 +1,4 @@
-from lpython import i8, i16, i32, f32, i64, f64, ccall, overload
-
+from lpython import ccall, f32, f64, i8, i16, i32, i64, overload
 
 pi: f64 = 3.141592653589793238462643383279502884197
 e: f64 = 2.718281828459045235360287471352662497757
@@ -718,10 +717,11 @@ def frexp(x:f64) -> tuple[f64,i16]:
     m is a float and e is an integer such that x == m * 2**e exactly.
     '''
     exponent: i16 = i16(0)
-    while f64(fabs(x)) > f64(1.0):
+    x_: f64 = x
+    while f64(fabs(x_)) > f64(1.0):
         exponent += i16(1)
-        x /= 2.0
-    return x, exponent
+        x_ /= 2.0
+    return x_, exponent
 
 
 @overload
@@ -731,10 +731,11 @@ def frexp(x:f32) -> tuple[f32,i8]:
     m is a float and e is an integer such that x == m * 2**e exactly.
     '''
     exponent: i8 = i8(0)
+    x_: f32 = x
     while f32(fabs(x)) > f32(1.0):
         exponent += i8(1)
-        x /= f32(2.0)
-    return x, exponent
+        x_ /= f32(2.0)
+    return x_, exponent
 
 
 @overload