fix(rtl): don't use init_nil()

src/kern/init.zig

@@ -1,5 +1,4 @@
 const std = @import("std");
-const rtl = @import("rtl");
 const b = @import("base");
 const pl = b.pl;
 const ke = b.ke;
@@ -11,7 +10,6 @@ var thread0: ke.Thread = undefined;
 var stack: [8192]u8 align(16) = undefined;
 
 pub fn init(boot_info: *pl.BootInfo) linksection(b.init) void {
-    rtl.init();
     std.log.info("hello, world", .{});
     ki.impl.early_init();
     pl.early_init(boot_info);

src/rtl/bst.zig

@@ -7,20 +7,12 @@ pub const Node = struct {
     parent: TaggedPtr(Node),
 };
 
-pub var nil = Node{
+pub var nil: Node = .{
-    .left = undefined,
+    .left = &nil,
-    .right = undefined,
+    .right = &nil,
-    .parent = undefined,
+    .parent = .{ .value = 0 },
 };
 
-/// Initialize the sentinel nil node. This should be called before using any BSTs.
-pub fn init_nil() void {
-    nil.left = &nil;
-    nil.right = &nil;
-    nil.parent.set_ptr(&nil);
-    nil.parent.set_tag(0);
-}
-
 /// Base struct for binary search trees.
 /// This should be used as a field in other types that are based on binary search trees, such as red-black trees or AVL trees.
 pub fn BST(comptime cmp: fn (*Node, *Node) std.math.Order) type {
@@ -170,8 +162,6 @@ fn node_cmp(a: *Node, b: *Node) std.math.Order {
 }
 
 test BST {
-    init_nil();
-
     var tree: BST(node_cmp) = .init();
 
     var nodes = [_]MyNode{

src/rtl/rbtree.zig

@@ -307,7 +307,6 @@ fn check_invariants(tree: *RBTree(cmp_test_node)) !void {
 }
 
 fn make_tree() RBTree(cmp_test_node) {
-    bst.init_nil();
     return .init();
 }
 

src/rtl/root.zig

@@ -11,10 +11,6 @@ pub const bst = @import("bst.zig");
 pub const BST = bst.BST;
 pub const RBTree = @import("rbtree.zig").RBTree;
 
-pub fn init() void {
-    bst.init_nil();
-}
-
 test {
     std.testing.refAllDecls(@This());
 }