`x.py setup` fails with explicit panic

[Joshument]

When trying to run x.py setup, the program exits with an explicit panic and does not create the config.toml file. The error and full backtrace are as follows (on Arch Linux x86_64):

Building rustbuild
    Finished dev [unoptimized] target(s) in 0.03s
Welcome to the Rust project! What do you want to do with x.py?
a) library: Contribute to the standard library
b) compiler: Contribute to the compiler itself
c) codegen: Contribute to the compiler, and also modify LLVM or codegen
d) tools: Contribute to tools which depend on the compiler, but do not modify it directly (e.g. rustdoc, clippy, miri)
e) user: Install Rust from source
Please choose one (a/b/c/d/e): b
thread 'main' panicked at 'explicit panic', builder.rs:821:17
stack backtrace:
   0:     0x564136529f00 - std::backtrace_rs::backtrace::libunwind::trace::he4b135b282ad0bdb
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   1:     0x564136529f00 - std::backtrace_rs::backtrace::trace_unsynchronized::h95dd1a9f59a261f0
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x564136529f00 - std::sys_common::backtrace::_print_fmt::hb2d5f7f2edfb1871
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/std/src/sys_common/backtrace.rs:66:5
   3:     0x564136529f00 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hbbdb63e1a9e5bae0
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/std/src/sys_common/backtrace.rs:45:22
   4:     0x564136551afe - core::fmt::write::hc0fd3d64c7964deb
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/core/src/fmt/mod.rs:1202:17
   5:     0x564136524ca5 - std::io::Write::write_fmt::h1519d1f8a9f30a76
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/std/src/io/mod.rs:1679:15
   6:     0x56413652c053 - std::sys_common::backtrace::_print::h024f4799bdf90945
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/std/src/sys_common/backtrace.rs:48:5
   7:     0x56413652c053 - std::sys_common::backtrace::print::h7afbde668e15046e
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/std/src/sys_common/backtrace.rs:35:9
   8:     0x56413652c053 - std::panicking::default_hook::{{closure}}::hd91c46b08dd5ed53
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/std/src/panicking.rs:295:22
   9:     0x56413652bd3f - std::panicking::default_hook::hd24a3e5b374ef38d
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/std/src/panicking.rs:314:9
  10:     0x56413652c6fa - std::panicking::rust_panic_with_hook::h227f8f44fe4dcc4d
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/std/src/panicking.rs:698:17
  11:     0x56413652c5b1 - std::panicking::begin_panic_handler::{{closure}}::h643d0c4e5ea667c5
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/std/src/panicking.rs:586:13
  12:     0x56413652a3ac - std::sys_common::backtrace::__rust_end_short_backtrace::hfc98d21e90a8d7a6
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/std/src/sys_common/backtrace.rs:138:18
  13:     0x56413652c312 - rust_begin_unwind
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/std/src/panicking.rs:584:5
  14:     0x564135c3a223 - core::panicking::panic_fmt::h7c86307091386a9a
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/core/src/panicking.rs:142:14
  15:     0x564135c3a0ed - core::panicking::panic::h23b207df3263cf9f
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/core/src/panicking.rs:48:5
  16:     0x56413609dae5 - bootstrap::builder::Builder::new::hec49ddb1e7ccf756
                               at /home/josh/Documents/VsCode/Rust/rust/src/bootstrap/builder.rs:821:17
  17:     0x564135ccf382 - bootstrap::Build::build::h4dff643b0867023d
                               at /home/josh/Documents/VsCode/Rust/rust/src/bootstrap/lib.rs:658:18
  18:     0x564135c3b08c - bootstrap::main::h0575736a7a8a35ba
                               at /home/josh/Documents/VsCode/Rust/rust/src/bootstrap/bin/main.rs:50:5
  19:     0x564135c3c2f3 - core::ops::function::FnOnce::call_once::ha85b876461d50400
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/core/src/ops/function.rs:248:5
  20:     0x564135c3c519 - std::sys_common::backtrace::__rust_begin_short_backtrace::h737bf80906a2863c
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/std/src/sys_common/backtrace.rs:122:18
  21:     0x564135c3cff9 - std::rt::lang_start::{{closure}}::h59767c52524af4f2
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/std/src/rt.rs:166:18
  22:     0x56413651dd7f - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::hc94483205bc71284
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/core/src/ops/function.rs:283:13
  23:     0x56413651dd7f - std::panicking::try::do_call::haa04c06f92e34058
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/std/src/panicking.rs:492:40
  24:     0x56413651dd7f - std::panicking::try::h5948f6703ca9775f
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/std/src/panicking.rs:456:19
  25:     0x56413651dd7f - std::panic::catch_unwind::h52dcfc8399de3a68
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/std/src/panic.rs:137:14
  26:     0x56413651dd7f - std::rt::lang_start_internal::{{closure}}::h1fffe4b37fe998da
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/std/src/rt.rs:148:48
  27:     0x56413651dd7f - std::panicking::try::do_call::h771f2fee565f25f2
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/std/src/panicking.rs:492:40
  28:     0x56413651dd7f - std::panicking::try::h7bc1e762d5b9af82
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/std/src/panicking.rs:456:19
  29:     0x56413651dd7f - std::panic::catch_unwind::h6660f137bf3c4a00
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/std/src/panic.rs:137:14
  30:     0x56413651dd7f - std::rt::lang_start_internal::h3b9b5a43f1b6b3ca
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/std/src/rt.rs:148:20
  31:     0x564135c3cfd7 - std::rt::lang_start::hc85f891cccf9dcc8
                               at /rustc/2a65764f21cf10b7e03c645f1ad0946e42758e0a/library/std/src/rt.rs:165:17
  32:     0x564135c3b791 - main
  33:     0x7fd936aee290 - <unknown>
  34:     0x7fd936aee34a - __libc_start_main
  35:     0x564135c3a555 - _start
                               at /build/glibc/src/glibc/csu/../sysdeps/x86_64/start.S:115
  36:                0x0 - <unknown>
Build completed unsuccessfully in 0:00:01

[jyn514]

This is a regression from #101969. We can't create a Builder until the Setup subcommand has been handled. The fix is to move the initial_rustfmt call a little later to line 671.

rust/src/bootstrap/lib.rs

Line 658 in 56a35bc

let _ = &builder::Builder::new(&self).initial_rustfmt();

[compiler-errors]

I think this was fixed in #102557?