diff --git a/src/build_spectests.rs b/src/build_spectests.rs
index 04e06f4e4..cf1fefc8d 100644
--- a/src/build_spectests.rs
+++ b/src/build_spectests.rs
@@ -207,8 +207,7 @@ fn test_module_{}() {{
                     module,
                     module,
                     calls.join("\n    ")
-                )
-                .as_str(),
+                ).as_str(),
             );
         }
         self.module_calls.remove(&module);
@@ -234,8 +233,7 @@ fn test_module_{}() {{
                     .replace("\n", "\n    ")
                     .replace("\\", "\\\\")
                     .replace("\"", "\\\""),
-            )
-            .as_str(),
+            ).as_str(),
         );
 
         // We set the start call to the module
@@ -246,8 +244,7 @@ fn test_module_{}() {{
     result_object.instance.start();
 }}\n",
                 start_module_call
-            )
-            .as_str(),
+            ).as_str(),
         );
         self.module_calls
             .entry(self.last_module)
@@ -272,8 +269,7 @@ fn {}_assert_invalid() {{
                 // We do this to ident four spaces back
                 // String::from_utf8_lossy(&wasm_binary),
                 // wast_string.replace("\n", "\n    "),
-            )
-            .as_str(),
+            ).as_str(),
         );
     }
 
@@ -315,8 +311,7 @@ fn {}_assert_invalid() {{
                         func_return,
                         args_values.join(", "),
                         assertion,
-                    )
-                    .as_str(),
+                    ).as_str(),
                 );
                 self.module_calls
                     .entry(self.last_module)
@@ -373,8 +368,7 @@ fn {}_assert_invalid() {{
                         func_return,
                         args_values.join(", "),
                         assertion,
-                    )
-                    .as_str(),
+                    ).as_str(),
                 );
                 self.module_calls
                     .entry(self.last_module)
@@ -404,8 +398,7 @@ fn {}_assert_malformed() {{
                 // We do this to ident four spaces back
                 // String::from_utf8_lossy(&wasm_binary),
                 // wast_string.replace("\n", "\n    "),
-            )
-            .as_str(),
+            ).as_str(),
         );
     }
 
@@ -469,8 +462,7 @@ fn {}_assert_malformed() {{
                         func_return,
                         args_values.join(", "),
                         assertion,
-                    )
-                    .as_str(),
+                    ).as_str(),
                 );
                 Some(func_name)
                 // let mut module_calls = self.module_calls.get(&self.last_module).unwrap();
@@ -491,7 +483,7 @@ fn {}_assert_malformed() {{
             .or_insert(Vec::new())
             .push(action_fn_name.unwrap());
     }
-    
+
     fn visit_perform_action(&mut self, action: &Action) {
         let action_fn_name = self.visit_action(action, None);
 
@@ -525,8 +517,7 @@ fn {}() {{
                 trap_func_name,
                 self.last_module,
                 action_fn_name.unwrap(),
-            )
-            .as_str(),
+            ).as_str(),
         );
 
         // We don't group trap calls as they may cause memory faults
diff --git a/src/linkers/emscripten/abort.rs b/src/linkers/emscripten/abort.rs
index bb4cfa117..e2662bd19 100644
--- a/src/linkers/emscripten/abort.rs
+++ b/src/linkers/emscripten/abort.rs
@@ -1,9 +1,7 @@
-
 use crate::webassembly::Instance;
 use std::process;
 
-
 pub extern "C" fn abort(_code: i32, _instance: &Instance) {
     process::abort();
     // abort!("Aborted")
-}
\ No newline at end of file
+}
diff --git a/src/linkers/emscripten/mod.rs b/src/linkers/emscripten/mod.rs
index 235814ed0..2ae7ab420 100644
--- a/src/linkers/emscripten/mod.rs
+++ b/src/linkers/emscripten/mod.rs
@@ -1,8 +1,8 @@
 use crate::webassembly::ImportObject;
 
+mod abort;
 mod printf;
 mod putchar;
-mod abort;
 
 pub fn generate_emscripten_env<'a, 'b>() -> ImportObject<&'a str, &'b str> {
     let mut import_object = ImportObject::new();
diff --git a/src/linkers/mod.rs b/src/linkers/mod.rs
index c21b7bcbd..ef78d9e06 100644
--- a/src/linkers/mod.rs
+++ b/src/linkers/mod.rs
@@ -1,4 +1,3 @@
-
 pub mod emscripten;
 
 pub use self::emscripten::generate_emscripten_env;
diff --git a/src/main.rs b/src/main.rs
index 348787817..317fecf14 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,15 +1,15 @@
 #[macro_use]
 extern crate error_chain;
-extern crate libc;
 extern crate cranelift_codegen;
 extern crate cranelift_entity;
 extern crate cranelift_native;
 extern crate cranelift_wasm;
+extern crate libc;
+extern crate memmap;
+extern crate region;
 extern crate structopt;
 extern crate wabt;
 extern crate wasmparser;
-extern crate memmap;
-extern crate region;
 #[macro_use]
 extern crate target_lexicon;
 extern crate nix;
@@ -68,10 +68,16 @@ fn read_file_contents(path: &PathBuf) -> Result<Vec<u8>, io::Error> {
 
 /// Execute a WASM/WAT file
 fn execute_wasm(wasm_path: PathBuf) -> Result<(), String> {
-    let mut wasm_binary: Vec<u8> =
-        read_file_contents(&wasm_path).map_err(|err| format!("Can't read the file {}: {}", wasm_path.as_os_str().to_string_lossy(), err))?;
+    let mut wasm_binary: Vec<u8> = read_file_contents(&wasm_path).map_err(|err| {
+        format!(
+            "Can't read the file {}: {}",
+            wasm_path.as_os_str().to_string_lossy(),
+            err
+        )
+    })?;
     if !webassembly::utils::is_wasm_binary(&wasm_binary) {
-        wasm_binary = wabt::wat2wasm(wasm_binary).map_err(|err| format!("Can't convert from wast to wasm: {:?}", err))?;
+        wasm_binary = wabt::wat2wasm(wasm_binary)
+            .map_err(|err| format!("Can't convert from wast to wasm: {:?}", err))?;
     }
 
     let import_object = linkers::generate_emscripten_env();
diff --git a/src/sighandler.rs b/src/sighandler.rs
index d64bba470..d75fb179b 100644
--- a/src/sighandler.rs
+++ b/src/sighandler.rs
@@ -5,7 +5,7 @@
 //! Please read more about this here: https://github.com/CraneStation/wasmtime/issues/15
 //! This code is inspired by: https://github.com/pepyakin/wasmtime/commit/625a2b6c0815b21996e111da51b9664feb174622
 use nix::sys::signal::{
-    sigaction, Signal, SaFlags, SigAction, SigHandler, SigSet, SIGBUS, SIGFPE, SIGILL, SIGSEGV,
+    sigaction, SaFlags, SigAction, SigHandler, SigSet, Signal, SIGBUS, SIGFPE, SIGILL, SIGSEGV,
 };
 
 static mut SETJMP_BUFFER: [::nix::libc::c_int; 27] = [0; 27];
diff --git a/src/webassembly/instance.rs b/src/webassembly/instance.rs
index de8cf8b27..f357608ae 100644
--- a/src/webassembly/instance.rs
+++ b/src/webassembly/instance.rs
@@ -131,7 +131,7 @@ pub struct InstanceOptions {
     pub mock_missing_imports: bool,
 }
 
-extern fn mock_fn() -> i32 {
+extern "C" fn mock_fn() -> i32 {
     return 0;
 }
 
@@ -167,15 +167,16 @@ impl Instance {
             // We walk through the imported functions and set the relocations
             // for each of this functions to be an empty vector (as is defined outside of wasm)
             for (module, field) in module.info.imported_funcs.iter() {
-                let function = import_object
-                    .get(&module.as_str(), &field.as_str());
+                let function = import_object.get(&module.as_str(), &field.as_str());
                 let function = if options.mock_missing_imports {
                     function.unwrap_or_else(|| {
-                        debug!("The import {}.{} is not provided, therefore will be mocked.", module, field);
+                        debug!(
+                            "The import {}.{} is not provided, therefore will be mocked.",
+                            module, field
+                        );
                         mock_fn as *const u8
                     })
-                }
-                else {
+                } else {
                     function.ok_or_else(|| {
                         ErrorKind::LinkError(format!(
                             "Imported function {}.{} was not provided in the import_functions",
diff --git a/src/webassembly/memory.rs b/src/webassembly/memory.rs
index 5330a60f3..b67253d7f 100644
--- a/src/webassembly/memory.rs
+++ b/src/webassembly/memory.rs
@@ -108,7 +108,7 @@ impl LinearMemory {
             // Copy old mem to new mem. Will a while loop be faster or is this going to be optimized?
             // TODO: Consider static heap for efficiency.
             for i in 0..prev_bytes {
-                 unsafe {
+                unsafe {
                     let new_mmap_index = new_mmap.get_unchecked_mut(i);
                     let old_mmap_index = self.mmap.get_unchecked(i);
                     *new_mmap_index = *old_mmap_index;
diff --git a/src/webassembly/mod.rs b/src/webassembly/mod.rs
index a3be88647..2beb17e88 100644
--- a/src/webassembly/mod.rs
+++ b/src/webassembly/mod.rs
@@ -47,7 +47,13 @@ pub fn instantiate(
 ) -> Result<ResultObject, ErrorKind> {
     let module = compile(buffer_source)?;
     debug!("webassembly - creating instance");
-    let instance = Instance::new(&module, &import_object, InstanceOptions { mock_missing_imports: true })?;
+    let instance = Instance::new(
+        &module,
+        &import_object,
+        InstanceOptions {
+            mock_missing_imports: true,
+        },
+    )?;
     debug!("webassembly - instance created");
     Ok(ResultObject { module, instance })
 }
@@ -100,7 +106,12 @@ pub fn validate_or_error(bytes: &[u8]) -> Result<(), ErrorKind> {
         let state = parser.read();
         match *state {
             wasmparser::ParserState::EndWasm => return Ok(()),
-            wasmparser::ParserState::Error(err) => return Err(ErrorKind::CompileError(format!("Validation error: {}", err.message))),
+            wasmparser::ParserState::Error(err) => {
+                return Err(ErrorKind::CompileError(format!(
+                    "Validation error: {}",
+                    err.message
+                )))
+            }
             _ => (),
         }
     }
diff --git a/src/webassembly/module.rs b/src/webassembly/module.rs
index 27fd8b785..1094fdcdc 100644
--- a/src/webassembly/module.rs
+++ b/src/webassembly/module.rs
@@ -427,9 +427,7 @@ impl<'environment> FuncEnvironmentTrait for FuncEnvironment<'environment> {
             base: heap_base,
             min_size: Imm64::new(0),
             guard_size: Imm64::new(LinearMemory::DEFAULT_GUARD_SIZE as i64),
-            style: ir::HeapStyle::Dynamic {
-                bound_gv,
-            },
+            style: ir::HeapStyle::Dynamic { bound_gv },
             index_type: I32,
         })
 
@@ -535,7 +533,6 @@ impl<'environment> FuncEnvironmentTrait for FuncEnvironment<'environment> {
             .special_param(ir::ArgumentPurpose::VMContext)
             .expect("Missing vmctx parameter");
 
-
         // The `callee` value is an index into a table of function pointers.
         // Apparently, that table is stored at absolute address 0 in this dummy environment.
         // TODO: Generate bounds checking code.