Fix tidy errors

Author: bjorn3

src/librustc_driver/driver.rs

@@ -95,7 +95,7 @@ pub fn compile_input(sess: &Session,
 
         if sess.opts.crate_types.iter().all(|&t|{
             t != CrateType::CrateTypeRlib && t != CrateType::CrateTypeExecutable
-        }) {
+        }) && !sess.opts.crate_types.is_empty() {
             sess.err(
                 "LLVM is not supported by this rustc, so non rlib libraries are not supported"
             );

src/librustc_driver/lib.rs

@@ -157,28 +157,36 @@ pub use no_llvm_metadata_loader::NoLLvmMetadataLoader as MetadataLoader;
 pub use rustc_trans::LlvmMetadataLoader as MetadataLoader;
 
 #[cfg(not(feature="llvm"))]
-mod no_llvm_metadata_loader{
+mod no_llvm_metadata_loader {
     extern crate ar;
     extern crate owning_ref;
-    
+
     use rustc::middle::cstore::MetadataLoader as MetadataLoaderTrait;
     use rustc_back::target::Target;
     use std::io;
     use std::fs::File;
     use std::path::Path;
-    
+
     use self::ar::Archive;
     use self::owning_ref::{OwningRef, ErasedBoxRef};
 
     pub struct NoLLvmMetadataLoader;
 
     impl MetadataLoaderTrait for NoLLvmMetadataLoader {
-        fn get_rlib_metadata(&self, _: &Target, filename: &Path) -> Result<ErasedBoxRef<[u8]>, String> {
-            let file = File::open(filename).map_err(|e|format!("metadata file open err: {:?}", e))?;
+        fn get_rlib_metadata(
+            &self,
+            _: &Target,
+            filename: &Path
+        ) -> Result<ErasedBoxRef<[u8]>, String> {
+            let file = File::open(filename).map_err(|e| {
+                format!("metadata file open err: {:?}", e)
+            })?;
             let mut archive = Archive::new(file);
 
             while let Some(entry_result) = archive.next_entry() {
-                let mut entry = entry_result.map_err(|e|format!("metadata section read err: {:?}", e))?;
+                let mut entry = entry_result.map_err(|e| {
+                    format!("metadata section read err: {:?}", e)
+                })?;
                 if entry.header().identifier() == "rust.metadata.bin" {
                     let mut buf = Vec::new();
                     io::copy(&mut entry, &mut buf).unwrap();