fix: memory issues, parser errors and get_ast_if returning always NULL

src/parser/grammar.c

@@ -140,6 +140,7 @@ bool grammar_init(void)
 
     // Element
     add_first(RULE_ELEMENT, TOKEN_WORD);
+    add_first(RULE_ELEMENT, TOKEN_ASSIGNMENT_WORD);
     add_firsts(RULE_ELEMENT, first(RULE_REDIRECTION));
 
     // Prefix

src/parser/grammar_basic.c

@@ -281,7 +281,7 @@ struct ast *parse_simple_command(struct lexer_context *ctx)
 struct ast *parse_element(struct lexer_context *ctx)
 {
     struct token *token = PEEK_TOKEN();
-    if (token->type == TOKEN_WORD)
+    if (token->type == TOKEN_WORD || token->type == TOKEN_ASSIGNMENT_WORD)
     {
         token = POP_TOKEN();
         return ast_create_word(token->data);