v panic when embedding struct alias into another struct

[islonely]

V doctor:

V full version: V 0.4.9 4225a34.b79257b
OS: macos, macOS, 15.1.1, 24B91
Processor: 8 cpus, 64bit, little endian, Apple M3

getwd: /Users/adamoates/Documents/v_tests
vexe: /Users/adamoates/v/v
vexe mtime: 2025-01-02 15:24:10

vroot: OK, value: /Users/adamoates/v
VMODULES: OK, value: /Users/adamoates/.vmodules
VTMP: OK, value: /tmp/v_501

Git version: git version 2.39.5 (Apple Git-154)
Git vroot status: weekly.2024.53-14-gb79257b7 (1 commit(s) behind V master)
.git/config present: true

CC version: Apple clang version 16.0.0 (clang-1600.0.26.4)
emcc version: N/A
thirdparty/tcc status: thirdparty-macos-arm64 713692d4

What did you do?
./v -g -o vdbg cmd/v && ./vdbg /Users/adamoates/Documents/v_tests/test.v && /Users/adamoates/Documents/v_tests/test

struct Foo1 {}

type Foo2 = Foo1

struct Bar {
	Foo2
}

fn main() {
	println(Bar{})
}

What did you see?

================ V panic ================
   module: builtin
 function: __as_cast()
  message: as cast: cannot cast `v.ast.Alias` to `v.ast.Struct`
     file: /Users/adamoates/v/vlib/builtin/builtin.v:40
   v hash: b79257b
=========================================
0   vdbg                                0x000000010221563c __as_cast + 588
1   vdbg                                0x0000000102493298 v__gen__c__Gen_struct_init + 7460
2   vdbg                                0x00000001023ebda8 v__gen__c__Gen_expr + 11644
3   vdbg                                0x00000001023ede74 v__gen__c__Gen_expr_with_cast + 5608
4   vdbg                                0x000000010240381c v__gen__c__Gen_gen_expr_to_string + 4340
5   vdbg                                0x00000001024b9aa4 v__gen__c__Gen_fn_call + 10020
6   vdbg                                0x0000000102473d14 v__gen__c__Gen_call_expr + 5328
7   vdbg                                0x00000001023e9894 v__gen__c__Gen_expr + 2152
8   vdbg                                0x00000001024548f0 v__gen__c__Gen_stmt + 1356
9   vdbg                                0x0000000102453fcc v__gen__c__Gen_stmts_with_tmp_var + 3616
10  vdbg                                0x00000001024052d4 v__gen__c__Gen_stmts + 88
11  vdbg                                0x00000001024b155c v__gen__c__Gen_gen_fn_decl + 16168
12  vdbg                                0x0000000102456aa0 v__gen__c__Gen_fn_decl + 2504
13  vdbg                                0x000000010245447c v__gen__c__Gen_stmt + 216
14  vdbg                                0x0000000102453fcc v__gen__c__Gen_stmts_with_tmp_var + 3616
15  vdbg                                0x00000001024052d4 v__gen__c__Gen_stmts + 88
16  vdbg                                0x000000010243c2a4 v__gen__c__Gen_gen_file + 384
17  vdbg                                0x000000010243bda0 v__gen__c__cgen_process_one_file_cb + 5484
18  vdbg                                0x00000001022633fc sync__pool__process_in_thread + 152
19  vdbg                                0x00000001021e8b64 sync__pool__process_in_thread_thread_wrapper + 44
20  libsystem_pthread.dylib             0x0000000194c7f2e4 _pthread_start + 136
21  libsystem_pthread.dylib             0x0000000194c7a0fc thread_start + 8

What did you expect to see?

Expected Foo1 to be embedded into Bar with the field name as Foo2

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_{Huly®: V_0.6-21778}