diff --git a/build.rs b/build.rs
index be655f51c..2e5bd948b 100644
--- a/build.rs
+++ b/build.rs
@@ -12,11 +12,11 @@ fn main() {
     // language server.
     let build_dir = format!("{}/build", env!("CARGO_MANIFEST_DIR"));
     let build_dir = option_env!("FISH_BUILD_DIR").unwrap_or(&build_dir);
-    rsconf::set_env_value("FISH_BUILD_DIR", &build_dir);
+    rsconf::set_env_value("FISH_BUILD_DIR", build_dir);
 
     cc::Build::new()
         .file("src/libc.c")
-        .include(&build_dir)
+        .include(build_dir)
         .compile("flibc.a");
 
     let mut build = cc::Build::new();
diff --git a/src/color.rs b/src/color.rs
index 000b45d6c..fa48dd1f8 100644
--- a/src/color.rs
+++ b/src/color.rs
@@ -448,7 +448,7 @@ mod tests {
 
     #[test]
     fn parse_rgb() {
-        assert!(RgbColor::from_wstr(L!("##FF00A0")) == None);
+        assert!(RgbColor::from_wstr(L!("##FF00A0")).is_none());
         assert!(RgbColor::from_wstr(L!("#FF00A0")) == Some(RgbColor::from_rgb(0xff, 0x00, 0xa0)));
         assert!(RgbColor::from_wstr(L!("FF00A0")) == Some(RgbColor::from_rgb(0xff, 0x00, 0xa0)));
         assert!(RgbColor::from_wstr(L!("FAF")) == Some(RgbColor::from_rgb(0xff, 0xaa, 0xff)));