diff --git a/bootstrap/Compilation.zig b/bootstrap/Compilation.zig
index 39ca4e2..e912026 100644
--- a/bootstrap/Compilation.zig
+++ b/bootstrap/Compilation.zig
@@ -1520,35 +1520,6 @@ pub const Builder = struct {
                 _ = expected_type; // autofix
                 unreachable;
             },
-            .assert => {
-                assert(argument_node_list.len == 1);
-                const boolean = try builder.resolveRuntimeValue(unit, context, Type.Expect{ .type = .bool }, argument_node_list[0], .right);
-                switch (boolean.value) {
-                    .@"comptime" => |ct| switch (ct) {
-                        .bool => |value| switch (value) {
-                            true => {},
-                            false => {
-                                @panic("Assert failed at comptime");
-                            },
-                        },
-                        else => |t| @panic(@tagName(t)),
-                    },
-                    .runtime => |instruction_index| {
-                        const true_block = try builder.newBasicBlock(unit, context);
-                        const false_block = try builder.newBasicBlock(unit, context);
-
-                        try builder.branch(unit, context, instruction_index, true_block, false_block);
-
-                        builder.current_basic_block = false_block;
-                        try builder.buildTrap(unit, context);
-
-                        builder.current_basic_block = true_block;
-                    },
-                    else => |t| @panic(@tagName(t)),
-                }
-
-                return undefined;
-            },
             .@"error" => {
                 assert(argument_node_list.len == 1);
                 // TODO: type
diff --git a/bootstrap/backend/llvm.zig b/bootstrap/backend/llvm.zig
index 6ec2aa5..11b071f 100644
--- a/bootstrap/backend/llvm.zig
+++ b/bootstrap/backend/llvm.zig
@@ -1180,7 +1180,7 @@ pub const LLVM = struct {
                     for (sema_function_prototype.argument_types) |argument_type_index| {
                         switch (unit.types.get(argument_type_index).*) {
                             // TODO: ABI
-                            .integer, .pointer, .@"enum", .@"struct", .slice => try parameter_types.append(context.allocator, try llvm.getType(unit, context, argument_type_index)),
+                            .integer, .pointer, .@"enum", .@"struct", .slice, .bool, => try parameter_types.append(context.allocator, try llvm.getType(unit, context, argument_type_index)),
                             else => |t| @panic(@tagName(t)),
                         }
                         // arg_types.appendAssumeCapacity(llvm_argument_type);
@@ -2878,7 +2878,8 @@ pub fn codegen(unit: *Compilation.Unit, context: *const Compilation.Context) !vo
                         switch (unit.types.get(argument_type_index).*) {
                             .void, .noreturn, .type => unreachable,
                             .comptime_int => unreachable,
-                            .bool => unreachable,
+                            .bool => {},
+                            // .bool => unreachable,
                             .@"struct" => {},
                             .@"enum" => {},
                             .function => unreachable,
diff --git a/lib/std/os.nat b/lib/std/os.nat
index 3a8c4ec..433cc5e 100644
--- a/lib/std/os.nat
+++ b/lib/std/os.nat
@@ -1,5 +1,6 @@
 const std = #import("std");
 const Allocator = std.Allocator;
+const assert = std.assert;
 const current = #import("builtin").os;
 const system = switch (current) {
     .linux => linux,
@@ -192,7 +193,7 @@ const current_executable_path = fn(buffer: [:0]u8) ?[]u8 {
                         }
                         i += 1;
                     }
-                    #assert(i < buffer.len);
+                    assert(i < buffer.len);
 
                     return result[0..i];
                 } else {
diff --git a/lib/std/std.nat b/lib/std/std.nat
index 85960b9..10b95d3 100644
--- a/lib/std/std.nat
+++ b/lib/std/std.nat
@@ -30,7 +30,7 @@ const format_usize = fn(n: usize, buffer: &[65]u8) []u8 {
         index -= 1;
         const ch = '0' + digit;
         buffer[index] = ch;
-        #assert(buffer[index] == ch);
+        assert(buffer[index] == ch);
         absolute /= 10;
 
         if (absolute == 0) {
@@ -44,7 +44,7 @@ const format_usize = fn(n: usize, buffer: &[65]u8) []u8 {
 const print_usize = fn(n: usize) void {
     var buffer: [65]u8 = undefined;
     const bytes = format_usize(n, buffer = buffer.&);
-    #assert(bytes.len < buffer.len);
+    assert(bytes.len < buffer.len);
     const file_descriptor = os.StdFileDescriptor.get(descriptor = .stdout);
     const file_writer = FileWriter{
         .descriptor = file_descriptor,
diff --git a/test/standalone/assert/main.nat b/test/standalone/assert/main.nat
index 3962d69..93f3035 100644
--- a/test/standalone/assert/main.nat
+++ b/test/standalone/assert/main.nat
@@ -1,7 +1,10 @@
+const std = #import("std");
+const assert = std.assert;
+
 const main = fn() s32 {
-    #assert(true);
+    assert(true);
     var a: s32 = 1;
     const is_not_one = a != 1;
-    #assert(!is_not_one);
+    assert(!is_not_one);
     return 0;
 }
diff --git a/test/standalone/bit_struct/main.nat b/test/standalone/bit_struct/main.nat
index 6b8e9da..dfa8c7f 100644
--- a/test/standalone/bit_struct/main.nat
+++ b/test/standalone/bit_struct/main.nat
@@ -1,3 +1,6 @@
+const std = #import("std");
+const assert = std.assert;
+
 const BitStruct = struct(u8) {
     a: bool,
     b: bool,
@@ -13,7 +16,7 @@ const main = fn () s32 {
         .d = 0,
     };
     const bitcast_bs: u8 = #cast(bs);
-    #assert(bitcast_bs == 6);
+    assert(bitcast_bs == 6);
 
     const const_bs = BitStruct{
         .a = true,
@@ -22,6 +25,6 @@ const main = fn () s32 {
         .d = 0,
     };
     const bitcast_const_bs: u8 = #cast(const_bs);
-    #assert(bitcast_const_bs == 5);
+    assert(bitcast_const_bs == 5);
     return 0;
 }
diff --git a/test/standalone/bit_struct_call/main.nat b/test/standalone/bit_struct_call/main.nat
index 2c99df8..fdec759 100644
--- a/test/standalone/bit_struct_call/main.nat
+++ b/test/standalone/bit_struct_call/main.nat
@@ -1,3 +1,6 @@
+const std = #import("std");
+const assert = std.assert;
+
 const A = struct(u8) {
     a: u4,
     b: u4,
@@ -21,8 +24,8 @@ const main = fn () s32 {
     };
 
     const b = transform(a);
-    #assert(a.a == b.a);
-    #assert(a.b == b.b);
+    assert(a.a == b.a);
+    assert(a.b == b.b);
 
     return 0;
 }
diff --git a/test/standalone/slice_len/main.nat b/test/standalone/slice_len/main.nat
index 46edb2e..4cae0c7 100644
--- a/test/standalone/slice_len/main.nat
+++ b/test/standalone/slice_len/main.nat
@@ -1,8 +1,10 @@
+const std = #import("std");
+const assert = std.assert;
 
 const main = fn() s32 {
     var buffer: [65]u8 = undefined;
     const slice = foo(5, buffer.&);
-    #assert(slice.len + 5 == buffer.len);
+    assert(slice.len + 5 == buffer.len);
     const result: u32 = #cast(slice.len + 5 - buffer.len);
     return #cast(result);
 }