Hello everyone! I’m a new bee of zig and get a segmentation fault when doing some programming practice that I can’t figure out why 
TODL: when using the captured inner of an optional pointer variable by if statement that segmentation fault error is got. code:
const Node = struct {
left: ?*Node,
right: ?*Node,
height: i32,
}
fn get_height(node: ?*Node) i32 {
if (node) |n| {
return n.height; // segmentation fault error here, I don't know why since n is valid here I think.
}
return 0;
The full code at Untitled (wftjtnuy) - PasteCode.io, download and save to main.zig, and run zig test main.zig :
3/3 main.test.remove...Segmentation fault at address 0x76551a5510d0
/home/lianxm/github/zig-playgroud/avltree/src/main.zig:227:45: 0x1049660 in update_height (test)
const left = get_height(node.left);
^
/home/lianxm/github/zig-playgroud/avltree/src/main.zig:120:39: 0x10e07d9 in remove (test)
root.update_height();
^
/home/lianxm/github/zig-playgroud/avltree/src/main.zig:38:40: 0x10e070b in remove (test)
const res = root.remove(key);
^
/home/lianxm/github/zig-playgroud/avltree/src/main.zig:297:22: 0x10e05ea in test.remove (test)
assert(avl.remove("C").? == 3);
^
/home/lianxm/bins/zig/lib/compiler/test_runner.zig:208:25: 0x10e7d4c in mainTerminal (test)
if (test_fn.func()) |_| {
^
/home/lianxm/bins/zig/lib/compiler/test_runner.zig:57:28: 0x10e1c50 in main (test)
return mainTerminal();
^
/home/lianxm/bins/zig/lib/std/start.zig:608:22: 0x10e11a6 in posixCallMainAndExit (test)
root.main();
^
/home/lianxm/bins/zig/lib/std/start.zig:248:5: 0x10e0dcf in _start (test)
asm volatile (switch (native_arch) {
^
???:?:?: 0x0 in ??? (???)
error: the following test command crashed:
/home/lianxm/github/zig-playgroud/avltree/.zig-cache/o/64fd7c657c613702f9ffade9b3582968/test --seed=0x98a9a639
``
