add FCW to warn about wasm ABI transition

1 files changed, 9 insertions, 0 deletions

diff --git a/compiler/rustc_monomorphize/src/errors.rs b/compiler/rustc_monomorphize/src/errors.rs
index 8dafbbca905..dffa372279f 100644
--- a/compiler/rustc_monomorphize/src/errors.rs
+++ b/compiler/rustc_monomorphize/src/errors.rs
@@ -103,3 +103,12 @@ pub(crate) struct AbiRequiredTargetFeature<'a> {
     /// Whether this is a problem at a call site or at a declaration.
     pub is_call: bool,
 }
+
+#[derive(LintDiagnostic)]
+#[diag(monomorphize_wasm_c_abi_transition)]
+#[help]
+pub(crate) struct WasmCAbiTransition<'a> {
+    pub ty: Ty<'a>,
+    /// Whether this is a problem at a call site or at a declaration.
+    pub is_call: bool,
+}