Update which.

emilio · emilio · commit dc85e444f8f0 · 2018-10-04T15:56:28.000+02:00
diff --git a/Cargo.lock b/Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
@@ -53,7 +53,7 @@ lazy_static = "1"
 peeking_take_while = "0.1.2"
 quote = { version = "0.5", default-features = false }
 regex = "1.0"
-which = "1.0.2"
+which = "2.0"
 # New validation in 0.3.6 breaks bindgen-integration:
 # https://github.com/alexcrichton/proc-macro2/commit/489c642.
 proc-macro2 = { version = "0.3.2, < 0.3.6", default-features = false }
diff --git a/src/lib.rs b/src/lib.rs
@@ -1820,7 +1820,7 @@ impl Bindings {
             None => {
                 let path = which::which("rustfmt")
                     .map_err(|e| {
-                        io::Error::new(io::ErrorKind::Other, e.to_owned())
+                        io::Error::new(io::ErrorKind::Other, format!("{}", e))
                     })?;
 
                 Cow::Owned(path)
