Fallback: call "rustfmt" directly without which

If the `which-rustfmt` feature isn't enabled, assume that the binary is
called "rustfmt" and that it is in the user's PATH, instead of returning
an error.

1 files changed, 3 insertions, 4 deletions

diff --git a/src/lib.rs b/src/lib.rs
index 57d46be7..f7957d84 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1958,10 +1958,9 @@ impl Bindings {
             }
         }
         #[cfg(not(feature = "which-rustfmt"))]
-        Err(io::Error::new(
-            io::ErrorKind::Other,
-            "which wasn't enabled, and no rustfmt binary specified",
-        ))
+        // No rustfmt binary was specified, so assume that the binary is called
+        // "rustfmt" and that it is in the user's PATH.
+        Ok(Cow::Owned("rustfmt".into()))
     }
 
     /// Checks if rustfmt_bindings is set and runs rustfmt on the string