ICE on inconsistent resolution for a macro

[Kixiron]

Code

The code is rather long and complicated, and I unfortunately don't have the time or will to attempt reduction as of now, so I committed it as-is to this file.
My conjecture takes some setup, so bear with me. My code involves meta-macros, or macros that create other macros. While debugging said meta-macro, I had an expanded version of it already in the source file, so something clashed there.
To encounter the ICE I simply ran cargo test

Meta

rustc --version --verbose:

rustc 1.41.1 (f3e1a954d 2020-02-24)
binary: rustc
commit-hash: f3e1a954d2ead4e2fc197c7da7d71e6c61bad196
commit-date: 2020-02-24
host: x86_64-pc-windows-msvc
release: 1.41.1
LLVM version: 9.0

Error output

>cargo t
    Blocking waiting for file lock on build directory
   Compiling tagged-box v0.1.1 (G:\LocalFileServer\Programming\Rust\tagged-box)
error: a macro named `__expand_tuple` has already been exported
   --> src\tagged_box_macro.rs:571:9
    |
571 | /         macro_rules! __expand_tuple {
572 | |             $( $finished )*
573 | |         }
    | |_________^ `__expand_tuple` already exported
...
577 | / generate_tuple_expansion! {
578 | |     ($, others)
579 | |     (0, a), (1, b), (2, c), (3, d),
580 | |     (4, e), (5, f), (6, g), (7, h),
...   |
586 | |     (28, cc), (29, dd), (30, ee), (31, ff)
587 | | }
    | |_- in this macro invocation
    |
note: previous macro export is now shadowed
   --> src\tagged_box_macro.rs:591:1
    |
591 | / macro_rules! __expand_tuple {
592 | |     ($variant:path) => {
593 | |         $variant()
594 | |     };
...   |
797 | |     };
798 | | }
    | |_^

error: aborting due to previous error

error: could not compile `tagged-box`.
warning: build failed, waiting for other jobs to finish...
error: a macro named `__expand_tuple` has already been exported
   --> src\tagged_box_macro.rs:571:9
    |
571 | /         macro_rules! __expand_tuple {
572 | |             $( $finished )*
573 | |         }
    | |_________^ `__expand_tuple` already exported
...
577 | / generate_tuple_expansion! {
578 | |     ($, others)
579 | |     (0, a), (1, b), (2, c), (3, d),
580 | |     (4, e), (5, f), (6, g), (7, h),
...   |
586 | |     (28, cc), (29, dd), (30, ee), (31, ff)
587 | | }
    | |_- in this macro invocation
    |
note: previous macro export is now shadowed
   --> src\tagged_box_macro.rs:591:1
    |
591 | / macro_rules! __expand_tuple {
592 | |     ($variant:path) => {
593 | |         $variant()
594 | |     };
...   |
797 | |     };
798 | | }
    | |_^

error: unexpected end of macro invocation
   --> src\tagged_box_macro.rs:904:68
    |
571 |         macro_rules! __expand_tuple {
    |         --------------------------- when calling this macro
...
904 |                     $crate::__expand_tuple!($enum::$variant, tuple, $($ty),*)
    |                                                                    ^ missing tokens in macro arguments

error: unknown macro variable `tagged`
    --> src\tagged_box_macro.rs:545:98
     |
545  |                       let $tuple = $dollar crate::TaggedBox::into_inner::<$dollar variant>($dollar tagged);
     |  __________________________________________________________________________________________________^
546  | |                     $dollar variant($( $access )* $dollar $tuple . $field)
547  | |                 }};
548  | |             ]
...    |
577  | | generate_tuple_expansion! {
578  | |     ($, others)
     | |_____^ unknown macro variable
...
1517 | /         tagged_box! {
1518 | |             #[derive(Debug, Clone, PartialEq, Eq)]
1519 | |             struct Container, enum Item {
1520 | |                 Unit,
...    |
1528 | |             }
1529 | |         }
     | |_________- in this macro invocation

error: unknown macro variable `tuple`
    --> src\tagged_box_macro.rs:516:39
     |
516  |               @inner ($dollar, $others, tuple)
     |  _______________________________________^
517  | |             [
518  | |                 // ($variant:path) => {
519  | |                 //     $variant()
...    |
577  | | generate_tuple_expansion! {
578  | |     ($, others)
     | |_____^ unknown macro variable
...
1517 | /         tagged_box! {
1518 | |             #[derive(Debug, Clone, PartialEq, Eq)]
1519 | |             struct Container, enum Item {
1520 | |                 Unit,
...    |
1528 | |             }
1529 | |         }
     | |_________- in this macro invocation

error: expected expression, found `.`
    --> src\tagged_box_macro.rs:550:44
     |
550  |               [ $( $access )* $dollar $tuple . $field, ]
     |                                              ^ expected expression
...
1517 | /         tagged_box! {
1518 | |             #[derive(Debug, Clone, PartialEq, Eq)]
1519 | |             struct Container, enum Item {
1520 | |                 Unit,
...    |
1528 | |             }
1529 | |         }
     | |_________- in this macro invocation

error: unexpected end of macro invocation
   --> src\tagged_box_macro.rs:826:78
    |
571 |         macro_rules! __expand_tuple {
    |         --------------------------- when calling this macro
...
826 |                 let variant = $crate::__expand_tuple!($enum::$variant, tuple, $($ty),*);
    |                                                                              ^ missing tokens in macro arguments

error: unknown macro variable `tagged`
    --> src\tagged_box_macro.rs:545:98
     |
545  |                       let $tuple = $dollar crate::TaggedBox::into_inner::<$dollar variant>($dollar tagged);
     |  __________________________________________________________________________________________________^
546  | |                     $dollar variant($( $access )* $dollar $tuple . $field)
547  | |                 }};
548  | |             ]
...    |
577  | | generate_tuple_expansion! {
578  | |     ($, others)
     | |_____^ unknown macro variable
...
1517 | /         tagged_box! {
1518 | |             #[derive(Debug, Clone, PartialEq, Eq)]
1519 | |             struct Container, enum Item {
1520 | |                 Unit,
...    |
1528 | |             }
1529 | |         }
     | |_________- in this macro invocation

error: unknown macro variable `tuple`
    --> src\tagged_box_macro.rs:516:39
     |
516  |               @inner ($dollar, $others, tuple)
     |  _______________________________________^
517  | |             [
518  | |                 // ($variant:path) => {
519  | |                 //     $variant()
...    |
577  | | generate_tuple_expansion! {
578  | |     ($, others)
     | |_____^ unknown macro variable
...
1517 | /         tagged_box! {
1518 | |             #[derive(Debug, Clone, PartialEq, Eq)]
1519 | |             struct Container, enum Item {
1520 | |                 Unit,
...    |
1528 | |             }
1529 | |         }
     | |_________- in this macro invocation

error: expected expression, found `.`
    --> src\tagged_box_macro.rs:550:44
     |
550  |               [ $( $access )* $dollar $tuple . $field, ]
     |                                              ^ expected expression
...
1517 | /         tagged_box! {
1518 | |             #[derive(Debug, Clone, PartialEq, Eq)]
1519 | |             struct Container, enum Item {
1520 | |                 Unit,
...    |
1528 | |             }
1529 | |         }
     | |_________- in this macro invocation

error: unexpected end of macro invocation
   --> src\tagged_box_macro.rs:991:68
    |
571 |         macro_rules! __expand_tuple {
    |         --------------------------- when calling this macro
...
991 |                     $crate::__expand_tuple!($enum::$variant, tuple, $( $ty ),*)
    |                                                                    ^ missing tokens in macro arguments

error: unknown macro variable `tagged`
    --> src\tagged_box_macro.rs:545:98
     |
545  |                       let $tuple = $dollar crate::TaggedBox::into_inner::<$dollar variant>($dollar tagged);
     |  __________________________________________________________________________________________________^
546  | |                     $dollar variant($( $access )* $dollar $tuple . $field)
547  | |                 }};
548  | |             ]
...    |
577  | | generate_tuple_expansion! {
578  | |     ($, others)
     | |_____^ unknown macro variable
...
1517 | /         tagged_box! {
1518 | |             #[derive(Debug, Clone, PartialEq, Eq)]
1519 | |             struct Container, enum Item {
1520 | |                 Unit,
...    |
1528 | |             }
1529 | |         }
     | |_________- in this macro invocation

error: unknown macro variable `tuple`
    --> src\tagged_box_macro.rs:516:39
     |
516  |               @inner ($dollar, $others, tuple)
     |  _______________________________________^
517  | |             [
518  | |                 // ($variant:path) => {
519  | |                 //     $variant()
...    |
577  | | generate_tuple_expansion! {
578  | |     ($, others)
     | |_____^ unknown macro variable
...
1517 | /         tagged_box! {
1518 | |             #[derive(Debug, Clone, PartialEq, Eq)]
1519 | |             struct Container, enum Item {
1520 | |                 Unit,
...    |
1528 | |             }
1529 | |         }
     | |_________- in this macro invocation

error: expected expression, found `.`
    --> src\tagged_box_macro.rs:550:44
     |
550  |               [ $( $access )* $dollar $tuple . $field, ]
     |                                              ^ expected expression
...
1517 | /         tagged_box! {
1518 | |             #[derive(Debug, Clone, PartialEq, Eq)]
1519 | |             struct Container, enum Item {
1520 | |                 Unit,
...    |
1528 | |             }
1529 | |         }
     | |_________- in this macro invocation

error: unexpected end of macro invocation
    --> src\tagged_box_macro.rs:1108:111
     |
571  |         macro_rules! __expand_tuple {
     |         --------------------------- when calling this macro
...
1108 |                     let variant = core::mem::ManuallyDrop::new($crate::__expand_tuple!($enum::$variant, tuple, $($ty),*));
     |                                                                                                               ^ missing tokens in macro arguments

error: unknown macro variable `tagged`
    --> src\tagged_box_macro.rs:545:98
     |
545  |                       let $tuple = $dollar crate::TaggedBox::into_inner::<$dollar variant>($dollar tagged);
     |  __________________________________________________________________________________________________^
546  | |                     $dollar variant($( $access )* $dollar $tuple . $field)
547  | |                 }};
548  | |             ]
...    |
577  | | generate_tuple_expansion! {
578  | |     ($, others)
     | |_____^ unknown macro variable
...
1517 | /         tagged_box! {
1518 | |             #[derive(Debug, Clone, PartialEq, Eq)]
1519 | |             struct Container, enum Item {
1520 | |                 Unit,
...    |
1528 | |             }
1529 | |         }
     | |_________- in this macro invocation

error: unknown macro variable `tuple`
    --> src\tagged_box_macro.rs:516:39
     |
516  |               @inner ($dollar, $others, tuple)
     |  _______________________________________^
517  | |             [
518  | |                 // ($variant:path) => {
519  | |                 //     $variant()
...    |
577  | | generate_tuple_expansion! {
578  | |     ($, others)
     | |_____^ unknown macro variable
...
1517 | /         tagged_box! {
1518 | |             #[derive(Debug, Clone, PartialEq, Eq)]
1519 | |             struct Container, enum Item {
1520 | |                 Unit,
...    |
1528 | |             }
1529 | |         }
     | |_________- in this macro invocation

error: expected expression, found `.`
    --> src\tagged_box_macro.rs:550:44
     |
550  |               [ $( $access )* $dollar $tuple . $field, ]
     |                                              ^ expected expression
...
1517 | /         tagged_box! {
1518 | |             #[derive(Debug, Clone, PartialEq, Eq)]
1519 | |             struct Container, enum Item {
1520 | |                 Unit,
...    |
1528 | |             }
1529 | |         }
     | |_________- in this macro invocation

thread 'rustc' panicked at 'src\librustc_resolve\macros.rs:742: inconsistent resolution for a macro', src\librustc\util\bug.rs:37:26
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.41.1 (f3e1a954d 2020-02-24) running on x86_64-pc-windows-msvc

note: compiler flags: -C debuginfo=2 -C incremental

note: some of the compiler flags provided by cargo are hidden

Backtrace

>cargo t
   Compiling tagged-box v0.1.1 (G:\LocalFileServer\Programming\Rust\tagged-box)
error: a macro named `__expand_tuple` has already been exported
   --> src\tagged_box_macro.rs:571:9
    |
571 | /         macro_rules! __expand_tuple {
572 | |             $( $finished )*
573 | |         }
    | |_________^ `__expand_tuple` already exported
...
577 | / generate_tuple_expansion! {
578 | |     ($, others)
579 | |     (0, a), (1, b), (2, c), (3, d),
580 | |     (4, e), (5, f), (6, g), (7, h),
...   |
586 | |     (28, cc), (29, dd), (30, ee), (31, ff)
587 | | }
    | |_- in this macro invocation
    |
note: previous macro export is now shadowed
   --> src\tagged_box_macro.rs:591:1
    |
591 | / macro_rules! __expand_tuple {
592 | |     ($variant:path) => {
593 | |         $variant()
594 | |     };
...   |
797 | |     };
798 | | }
    | |_^

error: aborting due to previous error

error: could not compile `tagged-box`.
warning: build failed, waiting for other jobs to finish...
error: a macro named `__expand_tuple` has already been exported
   --> src\tagged_box_macro.rs:571:9
    |
571 | /         macro_rules! __expand_tuple {
572 | |             $( $finished )*
573 | |         }
    | |_________^ `__expand_tuple` already exported
...
577 | / generate_tuple_expansion! {
578 | |     ($, others)
579 | |     (0, a), (1, b), (2, c), (3, d),
580 | |     (4, e), (5, f), (6, g), (7, h),
...   |
586 | |     (28, cc), (29, dd), (30, ee), (31, ff)
587 | | }
    | |_- in this macro invocation
    |
note: previous macro export is now shadowed
   --> src\tagged_box_macro.rs:591:1
    |
591 | / macro_rules! __expand_tuple {
592 | |     ($variant:path) => {
593 | |         $variant()
594 | |     };
...   |
797 | |     };
798 | | }
    | |_^

error: unexpected end of macro invocation
   --> src\tagged_box_macro.rs:904:68
    |
571 |         macro_rules! __expand_tuple {
    |         --------------------------- when calling this macro
...
904 |                     $crate::__expand_tuple!($enum::$variant, tuple, $($ty),*)
    |                                                                    ^ missing tokens in macro arguments

error: unknown macro variable `tagged`
    --> src\tagged_box_macro.rs:545:98
     |
545  |                       let $tuple = $dollar crate::TaggedBox::into_inner::<$dollar variant>($dollar tagged);
     |  __________________________________________________________________________________________________^
546  | |                     $dollar variant($( $access )* $dollar $tuple . $field)
547  | |                 }};
548  | |             ]
...    |
577  | | generate_tuple_expansion! {
578  | |     ($, others)
     | |_____^ unknown macro variable
...
1517 | /         tagged_box! {
1518 | |             #[derive(Debug, Clone, PartialEq, Eq)]
1519 | |             struct Container, enum Item {
1520 | |                 Unit,
...    |
1528 | |             }
1529 | |         }
     | |_________- in this macro invocation

error: unknown macro variable `tuple`
    --> src\tagged_box_macro.rs:516:39
     |
516  |               @inner ($dollar, $others, tuple)
     |  _______________________________________^
517  | |             [
518  | |                 // ($variant:path) => {
519  | |                 //     $variant()
...    |
577  | | generate_tuple_expansion! {
578  | |     ($, others)
     | |_____^ unknown macro variable
...
1517 | /         tagged_box! {
1518 | |             #[derive(Debug, Clone, PartialEq, Eq)]
1519 | |             struct Container, enum Item {
1520 | |                 Unit,
...    |
1528 | |             }
1529 | |         }
     | |_________- in this macro invocation

error: expected expression, found `.`
    --> src\tagged_box_macro.rs:550:44
     |
550  |               [ $( $access )* $dollar $tuple . $field, ]
     |                                              ^ expected expression
...
1517 | /         tagged_box! {
1518 | |             #[derive(Debug, Clone, PartialEq, Eq)]
1519 | |             struct Container, enum Item {
1520 | |                 Unit,
...    |
1528 | |             }
1529 | |         }
     | |_________- in this macro invocation

error: unexpected end of macro invocation
   --> src\tagged_box_macro.rs:826:78
    |
571 |         macro_rules! __expand_tuple {
    |         --------------------------- when calling this macro
...
826 |                 let variant = $crate::__expand_tuple!($enum::$variant, tuple, $($ty),*);
    |                                                                              ^ missing tokens in macro arguments

error: unknown macro variable `tagged`
    --> src\tagged_box_macro.rs:545:98
     |
545  |                       let $tuple = $dollar crate::TaggedBox::into_inner::<$dollar variant>($dollar tagged);
     |  __________________________________________________________________________________________________^
546  | |                     $dollar variant($( $access )* $dollar $tuple . $field)
547  | |                 }};
548  | |             ]
...    |
577  | | generate_tuple_expansion! {
578  | |     ($, others)
     | |_____^ unknown macro variable
...
1517 | /         tagged_box! {
1518 | |             #[derive(Debug, Clone, PartialEq, Eq)]
1519 | |             struct Container, enum Item {
1520 | |                 Unit,
...    |
1528 | |             }
1529 | |         }
     | |_________- in this macro invocation

error: unknown macro variable `tuple`
    --> src\tagged_box_macro.rs:516:39
     |
516  |               @inner ($dollar, $others, tuple)
     |  _______________________________________^
517  | |             [
518  | |                 // ($variant:path) => {
519  | |                 //     $variant()
...    |
577  | | generate_tuple_expansion! {
578  | |     ($, others)
     | |_____^ unknown macro variable
...
1517 | /         tagged_box! {
1518 | |             #[derive(Debug, Clone, PartialEq, Eq)]
1519 | |             struct Container, enum Item {
1520 | |                 Unit,
...    |
1528 | |             }
1529 | |         }
     | |_________- in this macro invocation

error: expected expression, found `.`
    --> src\tagged_box_macro.rs:550:44
     |
550  |               [ $( $access )* $dollar $tuple . $field, ]
     |                                              ^ expected expression
...
1517 | /         tagged_box! {
1518 | |             #[derive(Debug, Clone, PartialEq, Eq)]
1519 | |             struct Container, enum Item {
1520 | |                 Unit,
...    |
1528 | |             }
1529 | |         }
     | |_________- in this macro invocation

error: unexpected end of macro invocation
   --> src\tagged_box_macro.rs:991:68
    |
571 |         macro_rules! __expand_tuple {
    |         --------------------------- when calling this macro
...
991 |                     $crate::__expand_tuple!($enum::$variant, tuple, $( $ty ),*)
    |                                                                    ^ missing tokens in macro arguments

error: unknown macro variable `tagged`
    --> src\tagged_box_macro.rs:545:98
     |
545  |                       let $tuple = $dollar crate::TaggedBox::into_inner::<$dollar variant>($dollar tagged);
     |  __________________________________________________________________________________________________^
546  | |                     $dollar variant($( $access )* $dollar $tuple . $field)
547  | |                 }};
548  | |             ]
...    |
577  | | generate_tuple_expansion! {
578  | |     ($, others)
     | |_____^ unknown macro variable
...
1517 | /         tagged_box! {
1518 | |             #[derive(Debug, Clone, PartialEq, Eq)]
1519 | |             struct Container, enum Item {
1520 | |                 Unit,
...    |
1528 | |             }
1529 | |         }
     | |_________- in this macro invocation

error: unknown macro variable `tuple`
    --> src\tagged_box_macro.rs:516:39
     |
516  |               @inner ($dollar, $others, tuple)
     |  _______________________________________^
517  | |             [
518  | |                 // ($variant:path) => {
519  | |                 //     $variant()
...    |
577  | | generate_tuple_expansion! {
578  | |     ($, others)
     | |_____^ unknown macro variable
...
1517 | /         tagged_box! {
1518 | |             #[derive(Debug, Clone, PartialEq, Eq)]
1519 | |             struct Container, enum Item {
1520 | |                 Unit,
...    |
1528 | |             }
1529 | |         }
     | |_________- in this macro invocation

error: expected expression, found `.`
    --> src\tagged_box_macro.rs:550:44
     |
550  |               [ $( $access )* $dollar $tuple . $field, ]
     |                                              ^ expected expression
...
1517 | /         tagged_box! {
1518 | |             #[derive(Debug, Clone, PartialEq, Eq)]
1519 | |             struct Container, enum Item {
1520 | |                 Unit,
...    |
1528 | |             }
1529 | |         }
     | |_________- in this macro invocation

error: unexpected end of macro invocation
    --> src\tagged_box_macro.rs:1108:111
     |
571  |         macro_rules! __expand_tuple {
     |         --------------------------- when calling this macro
...
1108 |                     let variant = core::mem::ManuallyDrop::new($crate::__expand_tuple!($enum::$variant, tuple, $($ty),*));
     |                                                                                                               ^ missing tokens in macro arguments

error: unknown macro variable `tagged`
    --> src\tagged_box_macro.rs:545:98
     |
545  |                       let $tuple = $dollar crate::TaggedBox::into_inner::<$dollar variant>($dollar tagged);
     |  __________________________________________________________________________________________________^
546  | |                     $dollar variant($( $access )* $dollar $tuple . $field)
547  | |                 }};
548  | |             ]
...    |
577  | | generate_tuple_expansion! {
578  | |     ($, others)
     | |_____^ unknown macro variable
...
1517 | /         tagged_box! {
1518 | |             #[derive(Debug, Clone, PartialEq, Eq)]
1519 | |             struct Container, enum Item {
1520 | |                 Unit,
...    |
1528 | |             }
1529 | |         }
     | |_________- in this macro invocation

error: unknown macro variable `tuple`
    --> src\tagged_box_macro.rs:516:39
     |
516  |               @inner ($dollar, $others, tuple)
     |  _______________________________________^
517  | |             [
518  | |                 // ($variant:path) => {
519  | |                 //     $variant()
...    |
577  | | generate_tuple_expansion! {
578  | |     ($, others)
     | |_____^ unknown macro variable
...
1517 | /         tagged_box! {
1518 | |             #[derive(Debug, Clone, PartialEq, Eq)]
1519 | |             struct Container, enum Item {
1520 | |                 Unit,
...    |
1528 | |             }
1529 | |         }
     | |_________- in this macro invocation

error: expected expression, found `.`
    --> src\tagged_box_macro.rs:550:44
     |
550  |               [ $( $access )* $dollar $tuple . $field, ]
     |                                              ^ expected expression
...
1517 | /         tagged_box! {
1518 | |             #[derive(Debug, Clone, PartialEq, Eq)]
1519 | |             struct Container, enum Item {
1520 | |                 Unit,
...    |
1528 | |             }
1529 | |         }
     | |_________- in this macro invocation

thread 'rustc' panicked at 'src\librustc_resolve\macros.rs:742: inconsistent resolution for a macro', src\librustc\util\bug.rs:37:26
stack backtrace:
   0: <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt
   1: core::fmt::write
   2: <std::io::IoSliceMut as core::fmt::Debug>::fmt
   3: std::panicking::take_hook
   4: std::panicking::take_hook
   5: rustc_driver::report_ice
   6: std::panicking::rust_panic_with_hook
   7: <rustc_resolve::build_reduced_graph::BuildReducedGraphVisitor as syntax::visit::Visitor>::visit_ty
   8: <rustc_resolve::late::PathSource as core::fmt::Debug>::fmt
   9: <rustc_resolve::late::PathSource as core::fmt::Debug>::fmt
  10: <rustc_resolve::late::PathSource as core::fmt::Debug>::fmt
  11: <rustc_resolve::late::PathSource as core::fmt::Debug>::fmt
  12: <rustc_resolve::late::PathSource as core::fmt::Debug>::fmt
  13: rustc_resolve::macros::<impl rustc_resolve::Resolver>::resolve_macro_path
  14: rustc_resolve::Resolver::resolve_crate
  15: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::compile
  16: rustc_interface::queries::<impl rustc_interface::interface::Compiler>::compile
  17: rustc_interface::queries::Queries::expansion
  18: rustc_driver::pretty::print_after_hir_lowering
  19: <syntax_pos::symbol::SymbolStr as core::fmt::Display>::fmt
  20: <chalk_engine::stack::StackIndex as core::convert::From<usize>>::from
  21: <rustc_driver::Compilation as core::fmt::Debug>::fmt
  22: <chalk_engine::stack::StackIndex as core::convert::From<usize>>::from
  23: _rust_maybe_catch_panic
  24: rustc_driver::pretty::print_after_hir_lowering
  25: ZN244_$LT$std..error..$LT$impl$u20$core..convert..From$LT$alloc..string..String$GT$$u20$for$u20$alloc..boxed..Box$LT$dyn$u20$std..error..Error$u2b$core..marker..Send$u2b$core..marker..Sync$GT$$GT$..from..StringError$u20$as$u20$core..fmt..Display$GT$3fmt17
  26: std::sys::windows::thread::Thread::new
  27: BaseThreadInitThunk
  28: RtlUserThreadStart
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.41.1 (f3e1a954d 2020-02-24) running on x86_64-pc-windows-msvc

note: compiler flags: -C debuginfo=2 -C incremental

note: some of the compiler flags provided by cargo are hidden

query stack during panic:
end of query stack
error: aborting due to 17 previous errors

error: could not compile `tagged-box`.

To learn more, run the command again with --verbose.

[petrochenkov]

I have copypasted the provided code into the playground and the ICE doesn't reproduce.

Could you check whether it reproduces on nightly?
It could be fixed by the PR making duplicate_macro_exports an error (#65785).

[Kixiron]

Nightly 1.43.0-nightly (564758c4c 2020-03-08) does not ICE

[Enselic]

Triage: I can't reproduce the ICE with the exact compiler you originally reported to reproduce with. I run the following commands in PowerShell:

> rustup install 1.41.1 --profile minimal
> cargo +1.41.1 new --lib crash
> cd crash
> Invoke-WebRequest -Uri "https://raw.githubusercontent.com/Kixiron/tagged-box/563c864320a7f613db2961d87666215193e59beb/src/tagged_box_macro.rs" -OutFile "src/lib.rs"
> cargo +1.41.1 test
error: aborting due to 57 previous errors
# no ICE
> cargo +1.41.1 rustc -- --version --verbose
rustc 1.41.1 (f3e1a954d 2020-02-24)
binary: rustc
commit-hash: f3e1a954d2ead4e2fc197c7da7d71e6c61bad196
commit-date: 2020-02-24
host: x86_64-pc-windows-msvc
release: 1.41.1
LLVM version: 9.0

Can you reproduce with the above commands? What am I missing?

[Enselic]

Triage: Closing as not reproducible.