allow non-monomorphize modules to access hard-coded error message through new struct, use fluent message in monomorphize

1 files changed, 9 insertions, 0 deletions

diff --git a/compiler/rustc_hir/src/errors.rs b/compiler/rustc_hir/src/errors.rs
new file mode 100644
index 00000000000..7ed09d3f293
--- /dev/null
+++ b/compiler/rustc_hir/src/errors.rs
@@ -0,0 +1,9 @@
+use crate::LangItem;
+
+pub struct LangItemError(pub LangItem);
+
+impl ToString for LangItemError {
+    fn to_string(&self) -> String {
+        format!("requires `{}` lang_item", self.0.name())
+    }
+}