Disable the compare tests when the compare feature is disabled.

build.rs

@@ -1,10 +1,16 @@
+#[cfg(feature = "compare")]
 use std::env;
+#[cfg(feature = "compare")]
 use std::fs::File;
+#[cfg(feature = "compare")]
 use std::io::Write;
+#[cfg(feature = "compare")]
 use std::path::Path;
 
+#[cfg(feature = "compare")]
 use walkdir::WalkDir;
 
+#[cfg(feature = "compare")]
 fn main() {
     let out_dir = env::var("OUT_DIR").unwrap();
     let destination = Path::new(&out_dir).join("tests.rs");
@@ -31,6 +37,10 @@ fn main() {
     }
 }
 
+#[cfg(not(feature = "compare"))]
+fn main() {}
+
+#[cfg(feature = "compare")]
 fn write_test(test_file: &mut File, test: &walkdir::DirEntry) {
     let test_name = test
         .path()
@@ -55,6 +65,7 @@ fn write_test(test_file: &mut File, test: &walkdir::DirEntry) {
     .unwrap();
 }
 
+#[cfg(feature = "compare")]
 fn write_header(test_file: &mut File) {
     write!(
         test_file,
@@ -70,6 +81,7 @@ use organic::parser::sexp::sexp_with_padding;
     .unwrap();
 }
 
+#[cfg(feature = "compare")]
 fn is_expect_fail(name: &str) -> Option<&str> {
     match name {
         "autogen_greater_element_drawer_drawer_with_headline_inside" => Some("Apparently lines with :end: become their own paragraph. This odd behavior needs to be investigated more."),

tests/test_loader.rs

@@ -1 +1,2 @@
+#[cfg(feature = "compare")]
 include!(concat!(env!("OUT_DIR"), "/tests.rs"));