Skip to content
Merged
Changes from all commits
Commits
File filter

Filter by extension

Filter by extension

Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
11 changes: 11 additions & 0 deletions src/librustc_error_codes/error_codes/E0617.md
Original file line number Diff line number Diff line change
Expand Up @@ -17,3 +17,14 @@ Certain Rust types must be cast before passing them to a variadic function,
because of arcane ABI rules dictated by the C standard. To fix the error,
cast the value to the type specified by the error message (which you may need
to import from `std::os::raw`).

In this case, `c_double` has the same size as `f64` so we can use it directly:

```no_run
# extern {
# fn printf(c: *const i8, ...);
# }
unsafe {
printf(::std::ptr::null(), 0f64); // ok!
}
```