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-rw-r--r--src/libsyntax_ext/deriving/generic/mod.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libsyntax_ext/deriving/generic/mod.rs b/src/libsyntax_ext/deriving/generic/mod.rs
index 114bf437cfd..0d2f4eaaffd 100644
--- a/src/libsyntax_ext/deriving/generic/mod.rs
+++ b/src/libsyntax_ext/deriving/generic/mod.rs
@@ -788,6 +788,7 @@ fn find_repr_type_name(diagnostic: &Handler, type_attrs: &[ast::Attribute]) -> &
                 attr::ReprInt(attr::UnsignedInt(ast::UintTy::U8)) => "u8",
                 attr::ReprInt(attr::UnsignedInt(ast::UintTy::U16)) => "u16",
                 attr::ReprInt(attr::UnsignedInt(ast::UintTy::U32)) => "u32",
+                attr::ReprInt(attr::UnsignedInt(ast::UintTy::U64)) => "u64",
                 attr::ReprInt(attr::UnsignedInt(ast::UintTy::U128)) => "u128",
             }
         }