Duplication of child nodes in AST

[BrianTurza]

Currently, Pulzar sometimes is duplicating child nodes from body scope to main scope. This happens in nested loops and condtional statements. Here is example of code doing this:

Program Console;
float g = 9.81;
int i = 0;
int n = 5;
for i :: i < n :: i++ {
    for j :: j < n :: j++ {
        echo i;
    }
}

Pulzar language will produce AST like this, where builtin function echo is duplicated:

{'main_scope': [{'program': [{'type': 'Console'}]}, {'variable_declaration': [{'type': 'float'}, {'name': 'g'}, {'value': 9.81}]}, {'variable_declaration': [{'type': 'int'}, {'name': 'i'}, {'value': 0}]}, {'variable_declaration': [{'type': 'int'}, {'name': 'n'}, {'value': 5}]}, {'loop': [{'keyword': 'for'}, {'name': 'i'}, {'start_value': 0}, {'end_value': 'n'}, {'increment': '1'}, {'scope': [{'loop': [{'keyword': 'for'}, {'name': 'j'}, {'start_value': None}, {'end_value': 'n'}, {'increment': '1'}, {'scope': [{'builtin_function': [{'function': 'echo'}, {'argument': 'i'}]}]}]}]}]}, {'builtin_function': [{'function': 'echo'}, {'argument': 'i'}]}]}

Therefore it will generate invalid code with print function 2 times insted of ones:

g = 9.81
i = 0
n = 5
for i in range(0, n, 1):
    for j in range(0, n, 1):
        print(i)

print(i)

This bug is somewhere in the mparser.py. Probably somthing doesn't increases tokens_checked and/or self.token_index.