Support round tripping anyhow::Error over C FFI as void* #132
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Currently:
warning: `extern` fn uses type `anyhow::Error`, which is not FFI-safe
--> tests/test_ffi.rs:6:32
|
6 | pub extern "C" fn anyhow1(err: anyhow::Error) {
| ^^^^^^^^^^^^^ not FFI-safe
|
note: the lint level is defined here
--> tests/test_ffi.rs:1:26
|
1 | #![warn(improper_ctypes, improper_ctypes_definitions)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
= help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
= note: this struct has unspecified layout
warning: `extern` fn uses type `Option<anyhow::Error>`, which is not FFI-safe
--> tests/test_ffi.rs:16:32
|
16 | pub extern "C" fn anyhow3() -> Option<anyhow::Error> {
| ^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
|
= help: consider adding a `#[repr(C)]`, `#[repr(transparent)]`, or integer `#[repr(...)]` attribute to this enum
= note: enum has no representation hint
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Relevant to dtolnay/cxx#290.