FUCK YEAH, it works, it was the is_valid thing fo slices that was inverted, did the test by brute force and damn, is the expected AST

src/parser.c

@@ -74,7 +74,7 @@ ASTNode *parse_expr(ASTNodeSlice *slice, uint8_t min_bp) {
     *left_side = ASTNodeSlice_next(slice);
 
     while (true) {
-        if (ASTNodeSlice_is_valid(slice)) {
+        if (!ASTNodeSlice_is_valid(slice)) {
             break;
         }
 
@@ -102,35 +102,5 @@ ASTNode *parse_expr(ASTNodeSlice *slice, uint8_t min_bp) {
     return left_side;
 }
 
-void print_AST(AST tree) {
-    print_node(tree.head, 0);
-}
 
-void print_node(ASTNode *node, int depth) {
-    if (node == NULL) {
-        return;
-    }
-
-    if (node->type == NODE_BINARY_OP) {
-        print_node(node->data.binary.right, depth + 1);
-    }
-
-    for (int i = 0; i < depth; i++) {
-        printf("    ");
-    }
-
-    switch (node->type) {
-        case NODE_INTEGER:
-            printf("%ld\n", node->data.integer);
-            break;
-
-        case NODE_BINARY_OP:
-            printf("%c\n", operator_to_char(node->data.binary.op));
-            break;
-    }
-
-    if (node->type == NODE_BINARY_OP) {
-        print_node(node->data.binary.left, depth + 1);
-    }
-}