Commits on Dec 18, 2020

1. Add test of anyhow::Error in ffi signature …

   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

   

   dtolnay committed Dec 18, 2020
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   0a218a8 View commit details

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2. Mark Error repr transparent

   

   dtolnay committed Dec 18, 2020
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   3105a73 View commit details

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