Make wording verbose

2019-04-16 07:32:19 +09:00 · 2019-04-16 07:32:19 +09:00 · dce86f9dd5
commit dce86f9dd5
parent ae2ed2182b
1 changed files with 6 additions and 1 deletions
--- a/src/librustc_mir/transform/qualify_min_const_fn.rs
+++ b/src/librustc_mir/transform/qualify_min_const_fn.rs
@ -326,7 +326,12 @@ fn check_terminator(
                    abi::Abi::Rust if tcx.is_min_const_fn(def_id) => {},
                    abi::Abi::Rust => return Err((
                        span,
-                        "can only call other `const` within a `const`".into(),
+                        format!(
+                            "can only call other `const fn` within a `const fn`, \
+                             but `{:?}` is not stable as `const fn`",
+                            func,
+                        )
+                        .into(),
                    )),
                    abi => return Err((
                        span,