Format macro causes panic if it is inside closure which result is passed into a function that accepts less args.

[M1ngXU]

If using format inside a closure (e.g. in iter functions) and the returning String is passed into a function that takes less args, rustc panics.

Code

(||{})(format!("{}", (||format!("{}", "s"))()));

Minimized code snippet: #94599 (comment)

Meta

version: 1.60.0-beta.2 and 1.61.0-nightly

Error output

thread 'rustc' panicked at 'Box<dyn Any>', /rustc/c1d075a4592e1f9aef1f13e960cea0b03d2ad025/compiler/rustc_errors/src/lib.rs:1106:9
stack backtrace:
   0:     0x7f0a839f682c - std::backtrace_rs::backtrace::libunwind::trace::hf059f7d696f3ddd0
                               at /rustc/c1d075a4592e1f9aef1f13e960cea0b03d2ad025/library/std/src/../../backtrace/src/backtrace/libunwind.rs:93:5
   1:     0x7f0a839f682c - std::backtrace_rs::backtrace::trace_unsynchronized::h686db7ceab9bfd1a
                               at /rustc/c1d075a4592e1f9aef1f13e960cea0b03d2ad025/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x7f0a839f682c - std::sys_common::backtrace::_print_fmt::he4aca9613e5c3637
                               at /rustc/c1d075a4592e1f9aef1f13e960cea0b03d2ad025/library/std/src/sys_common/backtrace.rs:66:5
   3:     0x7f0a839f682c - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::h080145eaebef7a38
                               at /rustc/c1d075a4592e1f9aef1f13e960cea0b03d2ad025/library/std/src/sys_common/backtrace.rs:45:22
   4:     0x7f0a83a562cc - core::fmt::write::hb73cfe8a4b8d71a9
                               at /rustc/c1d075a4592e1f9aef1f13e960cea0b03d2ad025/library/core/src/fmt/mod.rs:1190:17
   5:     0x7f0a839e6aa8 - std::io::Write::write_fmt::h44625064880463d0
                               at /rustc/c1d075a4592e1f9aef1f13e960cea0b03d2ad025/library/std/src/io/mod.rs:1657:15
   6:     0x7f0a839fa7f7 - std::sys_common::backtrace::_print::h750dbecb76b2ec9e
                               at /rustc/c1d075a4592e1f9aef1f13e960cea0b03d2ad025/library/std/src/sys_common/backtrace.rs:48:5
   7:     0x7f0a839fa7f7 - std::sys_common::backtrace::print::hd7b9c9e26624b8b6
                               at /rustc/c1d075a4592e1f9aef1f13e960cea0b03d2ad025/library/std/src/sys_common/backtrace.rs:35:9
   8:     0x7f0a839fa7f7 - std::panicking::default_hook::{{closure}}::hcb767bb9dd055c7f
                               at /rustc/c1d075a4592e1f9aef1f13e960cea0b03d2ad025/library/std/src/panicking.rs:295:22
   9:     0x7f0a839fa4bf - std::panicking::default_hook::h5c8de2745bf115a6
                               at /rustc/c1d075a4592e1f9aef1f13e960cea0b03d2ad025/library/std/src/panicking.rs:314:9
  10:     0x7f0a84186551 - rustc_driver[691b9c2a58b062eb]::DEFAULT_HOOK::{closure#0}::{closure#0}
  11:     0x7f0a839fb0c5 - std::panicking::rust_panic_with_hook::heddcebbadb156565
                               at /rustc/c1d075a4592e1f9aef1f13e960cea0b03d2ad025/library/std/src/panicking.rs:702:17
  12:     0x7f0a844c0181 - std[6a13073971966f88]::panicking::begin_panic::<rustc_errors[a9175c9762cc5fd5]::ExplicitBug>::{closure#0}
  13:     0x7f0a844bfc66 - std[6a13073971966f88]::sys_common::backtrace::__rust_end_short_backtrace::<std[6a13073971966f88]::panicking::begin_panic<rustc_errors[a9175c9762cc5fd5]::ExplicitBug>::{closure#0}, !>
  14:     0x7f0a844c00cf - std[6a13073971966f88]::panicking::begin_panic::<rustc_errors[a9175c9762cc5fd5]::ExplicitBug>
  15:     0x7f0a844ebcad - std[6a13073971966f88]::panic::panic_any::<rustc_errors[a9175c9762cc5fd5]::ExplicitBug>
  16:     0x7f0a844e3d08 - <rustc_errors[a9175c9762cc5fd5]::HandlerInner>::span_bug::<rustc_span[6989153e7236b61f]::span_encoding::Span>
  17:     0x7f0a844e3a00 - <rustc_errors[a9175c9762cc5fd5]::Handler>::span_bug::<rustc_span[6989153e7236b61f]::span_encoding::Span>
  18:     0x7f0a8451f3a2 - rustc_middle[5e82cfb5c9ea2479]::ty::context::tls::with_opt::<rustc_middle[5e82cfb5c9ea2479]::util::bug::opt_span_bug_fmt<rustc_span[6989153e7236b61f]::span_encoding::Span>::{closure#0}, ()>
  19:     0x7f0a8451f960 - rustc_middle[5e82cfb5c9ea2479]::util::bug::opt_span_bug_fmt::<rustc_span[6989153e7236b61f]::span_encoding::Span>
  20:     0x7f0a8451f92c - rustc_middle[5e82cfb5c9ea2479]::util::bug::span_bug_fmt::<rustc_span[6989153e7236b61f]::span_encoding::Span>
  21:     0x7f0a8561e629 - <rustc_typeck[e808157a81a43890]::check::writeback::WritebackCx as rustc_hir[b06bc1d5472ce31]::intravisit::Visitor>::visit_local
  22:     0x7f0a8561b98f - <rustc_typeck[e808157a81a43890]::check::writeback::WritebackCx as rustc_hir[b06bc1d5472ce31]::intravisit::Visitor>::visit_expr
  23:     0x7f0a8561a99c - <rustc_typeck[e808157a81a43890]::check::writeback::WritebackCx as rustc_hir[b06bc1d5472ce31]::intravisit::Visitor>::visit_expr
  24:     0x7f0a85619e02 - <rustc_typeck[e808157a81a43890]::check::writeback::WritebackCx as rustc_hir[b06bc1d5472ce31]::intravisit::Visitor>::visit_expr
  25:     0x7f0a85619e25 - <rustc_typeck[e808157a81a43890]::check::writeback::WritebackCx as rustc_hir[b06bc1d5472ce31]::intravisit::Visitor>::visit_expr
  26:     0x7f0a8561b96e - <rustc_typeck[e808157a81a43890]::check::writeback::WritebackCx as rustc_hir[b06bc1d5472ce31]::intravisit::Visitor>::visit_expr
  27:     0x7f0a85554271 - <rustc_typeck[e808157a81a43890]::check::fn_ctxt::FnCtxt>::resolve_type_vars_in_body
  28:     0x7f0a855d0fe9 - <rustc_infer[f86b6e99fd53383b]::infer::InferCtxtBuilder>::enter::<&rustc_middle[5e82cfb5c9ea2479]::ty::context::TypeckResults, <rustc_typeck[e808157a81a43890]::check::inherited::InheritedBuilder>::enter<rustc_typeck[e808157a81a43890]::check::typeck_with_fallback<rustc_typeck[e808157a81a43890]::check::typeck::{closure#0}>::{closure#1}, &rustc_middle[5e82cfb5c9ea2479]::ty::context::TypeckResults>::{closure#0}>
  29:     0x7f0a855abbc3 - rustc_typeck[e808157a81a43890]::check::typeck
  30:     0x7f0a85a4b685 - rustc_query_system[832e6358829a14ea]::query::plumbing::try_execute_query::<rustc_query_impl[36da0ccdccd1cc1e]::plumbing::QueryCtxt, rustc_query_system[832e6358829a14ea]::query::caches::DefaultCache<rustc_span[6989153e7236b61f]::def_id::LocalDefId, &rustc_middle[5e82cfb5c9ea2479]::ty::context::TypeckResults>>
  31:     0x7f0a85aaa67c - <rustc_query_impl[36da0ccdccd1cc1e]::Queries as rustc_middle[5e82cfb5c9ea2479]::ty::query::QueryEngine>::typeck
  32:     0x7f0a855abd92 - rustc_typeck[e808157a81a43890]::check::typeck
  33:     0x7f0a85a4b685 - rustc_query_system[832e6358829a14ea]::query::plumbing::try_execute_query::<rustc_query_impl[36da0ccdccd1cc1e]::plumbing::QueryCtxt, rustc_query_system[832e6358829a14ea]::query::caches::DefaultCache<rustc_span[6989153e7236b61f]::def_id::LocalDefId, &rustc_middle[5e82cfb5c9ea2479]::ty::context::TypeckResults>>
  34:     0x7f0a85aaa67c - <rustc_query_impl[36da0ccdccd1cc1e]::Queries as rustc_middle[5e82cfb5c9ea2479]::ty::query::QueryEngine>::typeck
  35:     0x7f0a8560d73a - <rustc_middle[5e82cfb5c9ea2479]::hir::map::Map>::par_body_owners::<rustc_typeck[e808157a81a43890]::check::typeck_item_bodies::{closure#0}>
  36:     0x7f0a8628715c - rustc_typeck[e808157a81a43890]::check::typeck_item_bodies
  37:     0x7f0a864bb954 - rustc_query_system[832e6358829a14ea]::query::plumbing::try_execute_query::<rustc_query_impl[36da0ccdccd1cc1e]::plumbing::QueryCtxt, rustc_query_system[832e6358829a14ea]::query::caches::DefaultCache<(), ()>>
  38:     0x7f0a864e3548 - rustc_query_system[832e6358829a14ea]::query::plumbing::get_query::<rustc_query_impl[36da0ccdccd1cc1e]::queries::typeck_item_bodies, rustc_query_impl[36da0ccdccd1cc1e]::plumbing::QueryCtxt>
  39:     0x7f0a8628b649 - <rustc_session[9ca8810e328b55b5]::session::Session>::time::<(), rustc_typeck[e808157a81a43890]::check_crate::{closure#7}>
  40:     0x7f0a8627fb43 - rustc_typeck[e808157a81a43890]::check_crate
  41:     0x7f0a8601b587 - rustc_interface[9aa301a3811405e2]::passes::analysis
  42:     0x7f0a864b2383 - rustc_query_system[832e6358829a14ea]::query::plumbing::try_execute_query::<rustc_query_impl[36da0ccdccd1cc1e]::plumbing::QueryCtxt, rustc_query_system[832e6358829a14ea]::query::caches::DefaultCache<(), core[64c76e218c955efd]::result::Result<(), rustc_errors[a9175c9762cc5fd5]::ErrorReported>>>
  43:     0x7f0a864f12e5 - rustc_query_system[832e6358829a14ea]::query::plumbing::get_query::<rustc_query_impl[36da0ccdccd1cc1e]::queries::analysis, rustc_query_impl[36da0ccdccd1cc1e]::plumbing::QueryCtxt>
  44:     0x7f0a85ff9cc8 - <rustc_interface[9aa301a3811405e2]::passes::QueryContext>::enter::<rustc_driver[691b9c2a58b062eb]::run_compiler::{closure#1}::{closure#2}::{closure#3}, core[64c76e218c955efd]::result::Result<(), rustc_errors[a9175c9762cc5fd5]::ErrorReported>>
  45:     0x7f0a85fe8094 - rustc_interface[9aa301a3811405e2]::interface::create_compiler_and_run::<core[64c76e218c955efd]::result::Result<(), rustc_errors[a9175c9762cc5fd5]::ErrorReported>, rustc_driver[691b9c2a58b062eb]::run_compiler::{closure#1}>
  46:     0x7f0a85fcd734 - std[6a13073971966f88]::sys_common::backtrace::__rust_begin_short_backtrace::<rustc_interface[9aa301a3811405e2]::util::run_in_thread_pool_with_globals<rustc_interface[9aa301a3811405e2]::interface::run_compiler<core[64c76e218c955efd]::result::Result<(), rustc_errors[a9175c9762cc5fd5]::ErrorReported>, rustc_driver[691b9c2a58b062eb]::run_compiler::{closure#1}>::{closure#0}, core[64c76e218c955efd]::result::Result<(), rustc_errors[a9175c9762cc5fd5]::ErrorReported>>::{closure#0}, core[64c76e218c955efd]::result::Result<(), rustc_errors[a9175c9762cc5fd5]::ErrorReported>>
  47:     0x7f0a86000a99 - <<std[6a13073971966f88]::thread::Builder>::spawn_unchecked_<rustc_interface[9aa301a3811405e2]::util::run_in_thread_pool_with_globals<rustc_interface[9aa301a3811405e2]::interface::run_compiler<core[64c76e218c955efd]::result::Result<(), rustc_errors[a9175c9762cc5fd5]::ErrorReported>, rustc_driver[691b9c2a58b062eb]::run_compiler::{closure#1}>::{closure#0}, core[64c76e218c955efd]::result::Result<(), rustc_errors[a9175c9762cc5fd5]::ErrorReported>>::{closure#0}, core[64c76e218c955efd]::result::Result<(), rustc_errors[a9175c9762cc5fd5]::ErrorReported>>::{closure#1} as core[64c76e218c955efd]::ops::function::FnOnce<()>>::call_once::{shim:vtable#0}
  48:     0x7f0a83a06bb3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h47f7423189df9269
                               at /rustc/c1d075a4592e1f9aef1f13e960cea0b03d2ad025/library/alloc/src/boxed.rs:1854:9
  49:     0x7f0a83a06bb3 - <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once::h7e8094f66f114b55
                               at /rustc/c1d075a4592e1f9aef1f13e960cea0b03d2ad025/library/alloc/src/boxed.rs:1854:9
  50:     0x7f0a83a06bb3 - std::sys::unix::thread::Thread::new::thread_start::h928d5beb8b5b03f1
                               at /rustc/c1d075a4592e1f9aef1f13e960cea0b03d2ad025/library/std/src/sys/unix/thread.rs:108:17
  51:     0x7f0a8393a609 - start_thread
  52:     0x7f0a83853163 - clone
  53:                0x0 - <unknown>

query:

#0 [typeck] type-checking `main`
#1 [typeck] type-checking `main::{closure#0}`
#2 [typeck_item_bodies] type-checking all item bodies
#3 [analysis] running analysis passes on this crate

[M1ngXU]

playground link: https://play.rust-lang.org/?version=nightly&mode=debug&edition=2021&gist=8f160df4d4da266b4105b65244898f4c

[ouz-a]

Probably duplicate of #94516

[compiler-errors]

Actually, not sure if it's a duplicate of #94516. Still failing on master after the fix for that one landed, and failed with the same error (and not a duplicated adjustment bug) on beta. I will look into it!

@rustbot claim

[compiler-errors]

Minimized:

fn main() {
    (|| {})(|| {
        let b = 1;
    });
}