diff --git a/.github/workflows/main.yaml b/.github/workflows/main.yaml
index 396cc79..262c0b4 100644
--- a/.github/workflows/main.yaml
+++ b/.github/workflows/main.yaml
@@ -1,9 +1,16 @@
 name: Build
 
-on: [push]
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
 
 jobs:
   all:
+    name: All
     strategy:
       matrix:
         os:
diff --git a/src/function.rs b/src/function.rs
index e7ca280..4505198 100644
--- a/src/function.rs
+++ b/src/function.rs
@@ -1,6 +1,5 @@
 use crate::common::*;
 
-use target;
 use Function::*;
 
 pub(crate) enum Function {
diff --git a/src/lib.rs b/src/lib.rs
index cf59240..24d17e5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -8,8 +8,10 @@
   clippy::implicit_return,
   clippy::indexing_slicing,
   clippy::integer_arithmetic,
+  clippy::let_underscore_must_use,
   clippy::match_same_arms,
   clippy::missing_docs_in_private_items,
+  clippy::missing_errors_doc,
   clippy::missing_inline_in_public_items,
   clippy::needless_pass_by_value,
   clippy::non_ascii_literal,
@@ -24,8 +26,7 @@
   clippy::too_many_lines,
   clippy::unreachable,
   clippy::use_debug,
-  clippy::wildcard_enum_match_arm,
-  clippy::missing_errors_doc
+  clippy::wildcard_enum_match_arm
 )]
 
 #[macro_use]
diff --git a/src/shebang.rs b/src/shebang.rs
index b9e7b66..d74ac34 100644
--- a/src/shebang.rs
+++ b/src/shebang.rs
@@ -11,7 +11,7 @@ impl<'line> Shebang<'line> {
 
     let mut pieces = line[2..]
       .lines()
-      .nth(0)
+      .next()
       .unwrap_or("")
       .trim()
       .splitn(2, |c| c == ' ' || c == '\t');