Map core::convert::Infallible to a similar manually-defined struct

[ldk-c-bindings] / lightning-c-bindings / src / c_types / mod.rs

diff --git a/lightning-c-bindings/src/c_types/mod.rs b/lightning-c-bindings/src/c_types/mod.rs
index 5db6dda00b908375df6a5b02accae57d2f21a89a..18d8a08dfa7b5cda7b17e7c1ba33cd3cb28e7fd2 100644 (file)
--- a/lightning-c-bindings/src/c_types/mod.rs
+++ b/lightning-c-bindings/src/c_types/mod.rs
@@ -17,6 +17,16 @@ use std::convert::TryInto; // Bindings need at least rustc 1.34
 
 use std::io::{Cursor, Read}; // TODO: We should use core2 here when we support no_std
 
+#[repr(C)]
+/// A dummy struct of which an instance must never exist.
+/// This corresponds to the Rust type `Infallible`, or, in unstable rust, `!`
+pub struct NotConstructable {
+       _priv_thing: core::convert::Infallible,
+}
+impl From<core::convert::Infallible> for NotConstructable {
+       fn from(_: core::convert::Infallible) -> Self { unreachable!(); }
+}
+
 /// Integer in the range `0..32`
 #[derive(PartialEq, Eq, Copy, Clone)]
 #[allow(non_camel_case_types)]