From 8b4b259da2aa1a666806d39a63066bd07039e4e8 Mon Sep 17 00:00:00 2001 From: Ralf Jung Date: Sat, 4 May 2024 13:45:54 +0200 Subject: [PATCH] update 'unsupported' message --- src/tools/miri/README.md | 2 +- src/tools/miri/src/diagnostics.rs | 5 ++++- .../miri/tests/extern-so/fail/function_not_in_so.stderr | 3 ++- src/tools/miri/tests/fail-dep/shims/fs/close_stdout.stderr | 3 ++- .../miri/tests/fail-dep/shims/fs/read_from_stdout.stderr | 3 ++- src/tools/miri/tests/fail-dep/shims/fs/write_to_stdin.stderr | 3 ++- src/tools/miri/tests/fail-dep/tokio/sleep.stderr | 3 ++- .../tests/fail-dep/unsupported_incomplete_function.stderr | 3 ++- src/tools/miri/tests/fail/alloc/no_global_allocator.stderr | 3 ++- src/tools/miri/tests/fail/extern-type-field-offset.stderr | 3 ++- src/tools/miri/tests/fail/extern_static.stderr | 3 ++- src/tools/miri/tests/fail/extern_static_in_const.stderr | 3 ++- src/tools/miri/tests/fail/extern_static_wrong_size.stderr | 3 ++- ...sue-miri-3288-ice-symbolic-alignment-extern-static.stderr | 3 ++- .../tests/fail/shims/backtrace/bad-backtrace-flags.stderr | 3 ++- .../fail/shims/backtrace/bad-backtrace-resolve-flags.stderr | 3 ++- .../shims/backtrace/bad-backtrace-resolve-names-flags.stderr | 3 ++- .../fail/shims/backtrace/bad-backtrace-size-flags.stderr | 3 ++- .../promise_alignment.call_unaligned_ptr.stderr | 3 ++- .../fail/unaligned_pointers/promise_alignment_zero.stderr | 3 ++- src/tools/miri/tests/fail/unsized-local.stderr | 3 ++- .../miri/tests/fail/unsupported_foreign_function.stderr | 3 ++- 22 files changed, 45 insertions(+), 22 deletions(-) diff --git a/src/tools/miri/README.md b/src/tools/miri/README.md index ef01ca25fb0..5b088abcbe6 100644 --- a/src/tools/miri/README.md +++ b/src/tools/miri/README.md @@ -141,7 +141,7 @@ interpreter will explicitly tell you when it finds something unsupported: error: unsupported operation: can't call foreign function: bind ... = help: this is likely not a bug in the program; it indicates that the program \ - performed an operation that the interpreter does not support + performed an operation that Miri does not support ``` ### Cross-interpretation: running for different targets diff --git a/src/tools/miri/src/diagnostics.rs b/src/tools/miri/src/diagnostics.rs index 9fa786332e3..5fac922f568 100644 --- a/src/tools/miri/src/diagnostics.rs +++ b/src/tools/miri/src/diagnostics.rs @@ -320,7 +320,10 @@ pub fn report_error<'tcx, 'mir>( #[rustfmt::skip] let helps = match e.kind() { Unsupported(_) => - vec![(None, format!("this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support"))], + vec![ + (None, format!("this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support")), + (None, format!("if this is a basic API commonly used on this target, please report an issue; but note that Miri does not aim to support every FFI function out there")), + ], UndefinedBehavior(AlignmentCheckFailed { .. }) if ecx.machine.check_alignment == AlignmentCheck::Symbolic => diff --git a/src/tools/miri/tests/extern-so/fail/function_not_in_so.stderr b/src/tools/miri/tests/extern-so/fail/function_not_in_so.stderr index c031cb0146a..26761c48721 100644 --- a/src/tools/miri/tests/extern-so/fail/function_not_in_so.stderr +++ b/src/tools/miri/tests/extern-so/fail/function_not_in_so.stderr @@ -4,7 +4,8 @@ error: unsupported operation: can't call foreign function `foo` on $OS LL | foo(); | ^^^^^ can't call foreign function `foo` on $OS | - = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support + = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support + = help: if this is a basic API commonly used on this target, please report an issue; but note that Miri does not aim to support every FFI function out there = note: BACKTRACE: = note: inside `main` at $DIR/function_not_in_so.rs:LL:CC diff --git a/src/tools/miri/tests/fail-dep/shims/fs/close_stdout.stderr b/src/tools/miri/tests/fail-dep/shims/fs/close_stdout.stderr index 7547ec41719..e5048015765 100644 --- a/src/tools/miri/tests/fail-dep/shims/fs/close_stdout.stderr +++ b/src/tools/miri/tests/fail-dep/shims/fs/close_stdout.stderr @@ -4,7 +4,8 @@ error: unsupported operation: cannot close stdout LL | libc::close(1); | ^^^^^^^^^^^^^^ cannot close stdout | - = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support + = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support + = help: if this is a basic API commonly used on this target, please report an issue; but note that Miri does not aim to support every FFI function out there = note: BACKTRACE: = note: inside `main` at $DIR/close_stdout.rs:LL:CC diff --git a/src/tools/miri/tests/fail-dep/shims/fs/read_from_stdout.stderr b/src/tools/miri/tests/fail-dep/shims/fs/read_from_stdout.stderr index 355e16d5c34..fb0fb8acc3f 100644 --- a/src/tools/miri/tests/fail-dep/shims/fs/read_from_stdout.stderr +++ b/src/tools/miri/tests/fail-dep/shims/fs/read_from_stdout.stderr @@ -4,7 +4,8 @@ error: unsupported operation: cannot read from stdout LL | libc::read(1, bytes.as_mut_ptr() as *mut libc::c_void, 512); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot read from stdout | - = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support + = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support + = help: if this is a basic API commonly used on this target, please report an issue; but note that Miri does not aim to support every FFI function out there = note: BACKTRACE: = note: inside `main` at $DIR/read_from_stdout.rs:LL:CC diff --git a/src/tools/miri/tests/fail-dep/shims/fs/write_to_stdin.stderr b/src/tools/miri/tests/fail-dep/shims/fs/write_to_stdin.stderr index e2ebe234b0b..8426c5cb847 100644 --- a/src/tools/miri/tests/fail-dep/shims/fs/write_to_stdin.stderr +++ b/src/tools/miri/tests/fail-dep/shims/fs/write_to_stdin.stderr @@ -4,7 +4,8 @@ error: unsupported operation: cannot write to stdin LL | libc::write(0, bytes.as_ptr() as *const libc::c_void, 5); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ cannot write to stdin | - = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support + = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support + = help: if this is a basic API commonly used on this target, please report an issue; but note that Miri does not aim to support every FFI function out there = note: BACKTRACE: = note: inside `main` at $DIR/write_to_stdin.rs:LL:CC diff --git a/src/tools/miri/tests/fail-dep/tokio/sleep.stderr b/src/tools/miri/tests/fail-dep/tokio/sleep.stderr index 59179478c30..f7d829f77d2 100644 --- a/src/tools/miri/tests/fail-dep/tokio/sleep.stderr +++ b/src/tools/miri/tests/fail-dep/tokio/sleep.stderr @@ -9,7 +9,8 @@ LL | | timeout, LL | | )) | |__________^ returning ready events from epoll_wait is not yet implemented | - = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support + = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support + = help: if this is a basic API commonly used on this target, please report an issue; but note that Miri does not aim to support every FFI function out there error: aborting due to 1 previous error diff --git a/src/tools/miri/tests/fail-dep/unsupported_incomplete_function.stderr b/src/tools/miri/tests/fail-dep/unsupported_incomplete_function.stderr index fabe3bbf121..23327ff7dbd 100644 --- a/src/tools/miri/tests/fail-dep/unsupported_incomplete_function.stderr +++ b/src/tools/miri/tests/fail-dep/unsupported_incomplete_function.stderr @@ -4,7 +4,8 @@ error: unsupported operation: can't call foreign function `signal` on $OS LL | libc::signal(libc::SIGPIPE, libc::SIG_IGN); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ can't call foreign function `signal` on $OS | - = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support + = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support + = help: if this is a basic API commonly used on this target, please report an issue; but note that Miri does not aim to support every FFI function out there = note: BACKTRACE: = note: inside `main` at $DIR/unsupported_incomplete_function.rs:LL:CC diff --git a/src/tools/miri/tests/fail/alloc/no_global_allocator.stderr b/src/tools/miri/tests/fail/alloc/no_global_allocator.stderr index bd2a6c628f9..70f60a3f591 100644 --- a/src/tools/miri/tests/fail/alloc/no_global_allocator.stderr +++ b/src/tools/miri/tests/fail/alloc/no_global_allocator.stderr @@ -4,7 +4,8 @@ error: unsupported operation: can't call foreign function `__rust_alloc` on $OS LL | __rust_alloc(1, 1); | ^^^^^^^^^^^^^^^^^^ can't call foreign function `__rust_alloc` on $OS | - = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support + = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support + = help: if this is a basic API commonly used on this target, please report an issue; but note that Miri does not aim to support every FFI function out there = note: BACKTRACE: = note: inside `start` at $DIR/no_global_allocator.rs:LL:CC diff --git a/src/tools/miri/tests/fail/extern-type-field-offset.stderr b/src/tools/miri/tests/fail/extern-type-field-offset.stderr index cbbf1b38361..14609ec699c 100644 --- a/src/tools/miri/tests/fail/extern-type-field-offset.stderr +++ b/src/tools/miri/tests/fail/extern-type-field-offset.stderr @@ -4,7 +4,8 @@ error: unsupported operation: `extern type` does not have a known offset LL | let _field = &x.a; | ^^^^ `extern type` does not have a known offset | - = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support + = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support + = help: if this is a basic API commonly used on this target, please report an issue; but note that Miri does not aim to support every FFI function out there = note: BACKTRACE: = note: inside `main` at $DIR/extern-type-field-offset.rs:LL:CC diff --git a/src/tools/miri/tests/fail/extern_static.stderr b/src/tools/miri/tests/fail/extern_static.stderr index 34bb273f04b..1d12fd76bed 100644 --- a/src/tools/miri/tests/fail/extern_static.stderr +++ b/src/tools/miri/tests/fail/extern_static.stderr @@ -4,7 +4,8 @@ error: unsupported operation: extern static `FOO` is not supported by Miri LL | let _val = unsafe { std::ptr::addr_of!(FOO) }; | ^^^ extern static `FOO` is not supported by Miri | - = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support + = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support + = help: if this is a basic API commonly used on this target, please report an issue; but note that Miri does not aim to support every FFI function out there = note: BACKTRACE: = note: inside `main` at $DIR/extern_static.rs:LL:CC diff --git a/src/tools/miri/tests/fail/extern_static_in_const.stderr b/src/tools/miri/tests/fail/extern_static_in_const.stderr index 45d1632cce2..455d6af18e4 100644 --- a/src/tools/miri/tests/fail/extern_static_in_const.stderr +++ b/src/tools/miri/tests/fail/extern_static_in_const.stderr @@ -4,7 +4,8 @@ error: unsupported operation: extern static `E` is not supported by Miri LL | let _val = X; | ^ extern static `E` is not supported by Miri | - = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support + = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support + = help: if this is a basic API commonly used on this target, please report an issue; but note that Miri does not aim to support every FFI function out there = note: BACKTRACE: = note: inside `main` at $DIR/extern_static_in_const.rs:LL:CC diff --git a/src/tools/miri/tests/fail/extern_static_wrong_size.stderr b/src/tools/miri/tests/fail/extern_static_wrong_size.stderr index 27699d780c2..91afb936fac 100644 --- a/src/tools/miri/tests/fail/extern_static_wrong_size.stderr +++ b/src/tools/miri/tests/fail/extern_static_wrong_size.stderr @@ -4,7 +4,8 @@ error: unsupported operation: extern static `environ` has been declared as `exte LL | let _val = unsafe { environ }; | ^^^^^^^ extern static `environ` has been declared as `extern_static_wrong_size::environ` with a size of 1 bytes and alignment of 1 bytes, but Miri emulates it via an extern static shim with a size of N bytes and alignment of N bytes | - = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support + = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support + = help: if this is a basic API commonly used on this target, please report an issue; but note that Miri does not aim to support every FFI function out there = note: BACKTRACE: = note: inside `main` at $DIR/extern_static_wrong_size.rs:LL:CC diff --git a/src/tools/miri/tests/fail/issue-miri-3288-ice-symbolic-alignment-extern-static.stderr b/src/tools/miri/tests/fail/issue-miri-3288-ice-symbolic-alignment-extern-static.stderr index e5dbe749884..0d10b03fc4f 100644 --- a/src/tools/miri/tests/fail/issue-miri-3288-ice-symbolic-alignment-extern-static.stderr +++ b/src/tools/miri/tests/fail/issue-miri-3288-ice-symbolic-alignment-extern-static.stderr @@ -4,7 +4,8 @@ error: unsupported operation: extern static `_dispatch_queue_attr_concurrent` is LL | let _val = *DISPATCH_QUEUE_CONCURRENT; | ^^^^^^^^^^^^^^^^^^^^^^^^^ extern static `_dispatch_queue_attr_concurrent` is not supported by Miri | - = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support + = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support + = help: if this is a basic API commonly used on this target, please report an issue; but note that Miri does not aim to support every FFI function out there = note: BACKTRACE: = note: inside `main` at $DIR/issue-miri-3288-ice-symbolic-alignment-extern-static.rs:LL:CC diff --git a/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-flags.stderr b/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-flags.stderr index 2523e5063e1..ced44ee7768 100644 --- a/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-flags.stderr +++ b/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-flags.stderr @@ -4,7 +4,8 @@ error: unsupported operation: unknown `miri_get_backtrace` flags 2 LL | miri_get_backtrace(2, std::ptr::null_mut()); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unknown `miri_get_backtrace` flags 2 | - = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support + = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support + = help: if this is a basic API commonly used on this target, please report an issue; but note that Miri does not aim to support every FFI function out there = note: BACKTRACE: = note: inside `main` at $DIR/bad-backtrace-flags.rs:LL:CC diff --git a/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-resolve-flags.stderr b/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-resolve-flags.stderr index 36446ae283b..6e282ff4908 100644 --- a/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-resolve-flags.stderr +++ b/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-resolve-flags.stderr @@ -4,7 +4,8 @@ error: unsupported operation: unknown `miri_resolve_frame` flags 2 LL | miri_resolve_frame(buf[0], 2); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unknown `miri_resolve_frame` flags 2 | - = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support + = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support + = help: if this is a basic API commonly used on this target, please report an issue; but note that Miri does not aim to support every FFI function out there = note: BACKTRACE: = note: inside `main` at $DIR/bad-backtrace-resolve-flags.rs:LL:CC diff --git a/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-resolve-names-flags.stderr b/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-resolve-names-flags.stderr index ff60ab09172..ddf8d221cc4 100644 --- a/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-resolve-names-flags.stderr +++ b/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-resolve-names-flags.stderr @@ -4,7 +4,8 @@ error: unsupported operation: unknown `miri_resolve_frame_names` flags 2 LL | ... miri_resolve_frame_names(buf[0], 2, std::ptr::null_mut(), std::ptr::null_mut()); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unknown `miri_resolve_frame_names` flags 2 | - = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support + = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support + = help: if this is a basic API commonly used on this target, please report an issue; but note that Miri does not aim to support every FFI function out there = note: BACKTRACE: = note: inside `main` at $DIR/bad-backtrace-resolve-names-flags.rs:LL:CC diff --git a/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-size-flags.stderr b/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-size-flags.stderr index 6d4c370050f..b3186fc5b07 100644 --- a/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-size-flags.stderr +++ b/src/tools/miri/tests/fail/shims/backtrace/bad-backtrace-size-flags.stderr @@ -4,7 +4,8 @@ error: unsupported operation: unknown `miri_backtrace_size` flags 2 LL | miri_backtrace_size(2); | ^^^^^^^^^^^^^^^^^^^^^^ unknown `miri_backtrace_size` flags 2 | - = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support + = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support + = help: if this is a basic API commonly used on this target, please report an issue; but note that Miri does not aim to support every FFI function out there = note: BACKTRACE: = note: inside `main` at $DIR/bad-backtrace-size-flags.rs:LL:CC diff --git a/src/tools/miri/tests/fail/unaligned_pointers/promise_alignment.call_unaligned_ptr.stderr b/src/tools/miri/tests/fail/unaligned_pointers/promise_alignment.call_unaligned_ptr.stderr index e23ac5ac2fc..9ad715f7ba4 100644 --- a/src/tools/miri/tests/fail/unaligned_pointers/promise_alignment.call_unaligned_ptr.stderr +++ b/src/tools/miri/tests/fail/unaligned_pointers/promise_alignment.call_unaligned_ptr.stderr @@ -4,7 +4,8 @@ error: unsupported operation: `miri_promise_symbolic_alignment`: pointer is not LL | unsafe { utils::miri_promise_symbolic_alignment(align8.add(1).cast(), 8) }; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `miri_promise_symbolic_alignment`: pointer is not actually aligned | - = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support + = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support + = help: if this is a basic API commonly used on this target, please report an issue; but note that Miri does not aim to support every FFI function out there = note: BACKTRACE: = note: inside `main` at $DIR/promise_alignment.rs:LL:CC diff --git a/src/tools/miri/tests/fail/unaligned_pointers/promise_alignment_zero.stderr b/src/tools/miri/tests/fail/unaligned_pointers/promise_alignment_zero.stderr index b3327e04933..62b6e852311 100644 --- a/src/tools/miri/tests/fail/unaligned_pointers/promise_alignment_zero.stderr +++ b/src/tools/miri/tests/fail/unaligned_pointers/promise_alignment_zero.stderr @@ -4,7 +4,8 @@ error: unsupported operation: `miri_promise_symbolic_alignment`: alignment must LL | unsafe { utils::miri_promise_symbolic_alignment(buffer.as_ptr().cast(), 0) }; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `miri_promise_symbolic_alignment`: alignment must be a power of 2, got 0 | - = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support + = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support + = help: if this is a basic API commonly used on this target, please report an issue; but note that Miri does not aim to support every FFI function out there = note: BACKTRACE: = note: inside `main` at $DIR/promise_alignment_zero.rs:LL:CC diff --git a/src/tools/miri/tests/fail/unsized-local.stderr b/src/tools/miri/tests/fail/unsized-local.stderr index 0ffda9e6d63..d938f36bd5e 100644 --- a/src/tools/miri/tests/fail/unsized-local.stderr +++ b/src/tools/miri/tests/fail/unsized-local.stderr @@ -4,7 +4,8 @@ error: unsupported operation: unsized locals are not supported LL | let x = *(Box::new(A) as Box); | ^ unsized locals are not supported | - = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support + = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support + = help: if this is a basic API commonly used on this target, please report an issue; but note that Miri does not aim to support every FFI function out there = note: BACKTRACE: = note: inside `main` at $DIR/unsized-local.rs:LL:CC diff --git a/src/tools/miri/tests/fail/unsupported_foreign_function.stderr b/src/tools/miri/tests/fail/unsupported_foreign_function.stderr index 5a2f415bb84..7492fdd77bb 100644 --- a/src/tools/miri/tests/fail/unsupported_foreign_function.stderr +++ b/src/tools/miri/tests/fail/unsupported_foreign_function.stderr @@ -4,7 +4,8 @@ error: unsupported operation: can't call foreign function `foo` on $OS LL | foo(); | ^^^^^ can't call foreign function `foo` on $OS | - = help: this is likely not a bug in the program; it indicates that the program performed an operation that the interpreter does not support + = help: this is likely not a bug in the program; it indicates that the program performed an operation that Miri does not support + = help: if this is a basic API commonly used on this target, please report an issue; but note that Miri does not aim to support every FFI function out there = note: BACKTRACE: = note: inside `main` at $DIR/unsupported_foreign_function.rs:LL:CC