apitest: Rework OtterArgsSpec trait slightly

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/apitest/apitest.rs b/apitest/apitest.rs
index c327ee18ef904ec8f79e2dd11b579f9c03230188..dea84a0888bfab58fe5cbc105666f028a5656fab 100644 (file)
--- a/apitest/apitest.rs
+++ b/apitest/apitest.rs
@@ -751,9 +751,7 @@ impl<S> OtterArgsSpec for [S] where for <'s> &'s S: Into<String> {
   }
 }
 impl<S> OtterArgsSpec for Vec<S> where for <'s> &'s S: Into<String> {
-  fn to_args(&self) -> Vec<String> {
-    self.iter().map(|s| s.into()).collect()
-  }
+  fn to_args(&self) -> Vec<String> { self.as_slice().to_args() }
 }
 
 impl DirSubst {