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Async write prevents Rust bindings and component composition #870

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4 changes: 2 additions & 2 deletions proposals/cli/wit-0.3.0-draft/stdio.wit
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Original file line number Diff line number Diff line change
Expand Up @@ -45,7 +45,7 @@ interface stdout {
/// Otherwise if there is an error the readable end of the stream will be
/// dropped and this function will return an error-code.
@since(version = 0.3.0-rc-2026-01-06)
write-via-stream: async func(data: stream<u8>) -> result<_, error-code>;
write-via-stream: func(data: stream<u8>) -> future<result<_, error-code>>;
}

@since(version = 0.3.0-rc-2026-01-06)
Expand All @@ -61,5 +61,5 @@ interface stderr {
/// Otherwise if there is an error the readable end of the stream will be
/// dropped and this function will return an error-code.
@since(version = 0.3.0-rc-2026-01-06)
write-via-stream: async func(data: stream<u8>) -> result<_, error-code>;
write-via-stream: func(data: stream<u8>) -> future<result<_, error-code>>;
}
6 changes: 3 additions & 3 deletions proposals/filesystem/wit-0.3.0-draft/types.wit
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Expand Up @@ -329,12 +329,12 @@ interface types {
///
/// Note: This is similar to `pwrite` in POSIX.
@since(version = 0.3.0-rc-2026-01-06)
write-via-stream: async func(
write-via-stream: func(
/// Data to write
data: stream<u8>,
/// The offset within the file at which to start writing.
offset: filesize,
) -> result<_, error-code>;
) -> future<result<_, error-code>>;

/// Return a stream for appending to a file, if available.
///
Expand All @@ -345,7 +345,7 @@ interface types {
///
/// Note: This is similar to `write` with `O_APPEND` in POSIX.
@since(version = 0.3.0-rc-2026-01-06)
append-via-stream: async func(data: stream<u8>) -> result<_, error-code>;
append-via-stream: func(data: stream<u8>) -> future<result<_, error-code>>;

/// Provide file advisory information on a descriptor.
///
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2 changes: 1 addition & 1 deletion proposals/sockets/wit-0.3.0-draft/types.wit
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Expand Up @@ -309,7 +309,7 @@ interface types {
/// - <https://learn.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-send>
/// - <https://man.freebsd.org/cgi/man.cgi?query=send&sektion=2>
@since(version = 0.3.0-rc-2026-01-06)
send: async func(data: stream<u8>) -> result<_, error-code>;
send: func(data: stream<u8>) -> future<result<_, error-code>>;

/// Read data from peer.
///
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