1 files changed, 23 insertions, 0 deletions
diff --git a/subprojects/thiserror/tests/ui/duplicate-fmt.rs b/subprojects/thiserror/tests/ui/duplicate-fmt.rs
new file mode 100644
index 0000000..32f7a23
--- /dev/null
+++ b/subprojects/thiserror/tests/ui/duplicate-fmt.rs
@@ -0,0 +1,23 @@
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+#[error("...")]
+#[error("...")]
+pub struct Error;
+
+#[derive(Error, Debug)]
+#[error(fmt = core::fmt::Octal::fmt)]
+#[error(fmt = core::fmt::LowerHex::fmt)]
+pub enum FmtFmt {}
+
+#[derive(Error, Debug)]
+#[error(fmt = core::fmt::Octal::fmt)]
+#[error(transparent)]
+pub enum FmtTransparent {}
+
+#[derive(Error, Debug)]
+#[error(fmt = core::fmt::Octal::fmt)]
+#[error("...")]
+pub enum FmtDisplay {}
+
+fn main() {}