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-rw-r--r--crates/proc_macro_srv/src/lib.rs3
1 files changed, 2 insertions, 1 deletions
diff --git a/crates/proc_macro_srv/src/lib.rs b/crates/proc_macro_srv/src/lib.rs
index 6e890f8e2..9cca96994 100644
--- a/crates/proc_macro_srv/src/lib.rs
+++ b/crates/proc_macro_srv/src/lib.rs
@@ -40,7 +40,8 @@ impl ProcMacroSrv {
40 match expander.expand(&task.macro_name, &task.macro_body, task.attributes.as_ref()) { 40 match expander.expand(&task.macro_name, &task.macro_body, task.attributes.as_ref()) {
41 Ok(expansion) => Ok(ExpansionResult { expansion }), 41 Ok(expansion) => Ok(ExpansionResult { expansion }),
42 Err(msg) => { 42 Err(msg) => {
43 Err(format!("Cannot perform expansion for {}: error {:?}", &task.macro_name, msg)) 43 let msg = msg.as_str().unwrap_or("<unknown error>");
44 Err(format!("proc-macro panicked: {}", msg))
44 } 45 }
45 } 46 }
46 } 47 }