fix: added initial implementation for supporting internal function defintions

Author: arteevraina

integration_tests/CMakeLists.txt

@@ -669,6 +669,7 @@ RUN(NAME func_static_01 LABELS cpython llvm c wasm)
 RUN(NAME func_static_02 LABELS cpython llvm c wasm)
 RUN(NAME func_dep_03    LABELS cpython llvm c)
 RUN(NAME func_dep_04    LABELS cpython llvm c)
+RUN(NAME func_internal_def_01 LABELS cpython llvm c)
 
 RUN(NAME float_01 LABELS cpython llvm c wasm wasm_x64)
 RUN(NAME recursive_01 LABELS cpython llvm c wasm wasm_x64 wasm_x86)

integration_tests/func_internal_def_01.py

@@ -0,0 +1,11 @@
+def main():
+    x: i32
+    x = (2+3)*5
+    print(x)
+
+    def bar():
+        print("bar")
+        
+    bar()
+
+main()

src/lpython/semantics/python_ast_to_asr.cpp

@@ -4302,6 +4302,11 @@ class SymbolTableVisitor : public CommonVisitor<SymbolTableVisitor> {
             }
         } else {
             bool is_pure = false, is_module = false;
+            
+            for (size_t i = 0; i < x.n_body; i++) {
+                visit_stmt(*x.m_body[i]);
+            }
+            
             tmp = ASRUtils::make_Function_t_util(
                 al, x.base.base.loc,
                 /* a_symtab */ current_scope,