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-rw-r--r--src/libsyntax/ext/format.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libsyntax/ext/format.rs b/src/libsyntax/ext/format.rs
index 5d595474e9c..95c7fcc564a 100644
--- a/src/libsyntax/ext/format.rs
+++ b/src/libsyntax/ext/format.rs
@@ -654,6 +654,7 @@ impl<'a, 'b> Context<'a, 'b> {
             Known(ref tyname) => {
                 match tyname.as_slice() {
                     ""  => "Show",
+                    "?" => "Show",
                     "e" => "LowerExp",
                     "E" => "UpperExp",
                     "o" => "Octal",