Update to Rust 2018 edition (#632)

* initial cargo fix run

* Upgrade cranelift-entity crate

* Upgrade bforest crate

* Upgrade the codegen crate

* Upgrade the faerie crate

* Upgrade the filetests crate

* Upgrade the codegen-meta crate

* Upgrade the frontend crate

* Upgrade the cranelift-module crate

* Upgrade the cranelift-native crate

* Upgrade the cranelift-preopt crate

* Upgrade the cranelift-reader crate

* Upgrade the cranelift-serde crate

* Upgrade the cranelift-simplejit crate

* Upgrade the cranelift or cranelift-umbrella crate

* Upgrade the cranelift-wasm crate

* Upgrade cranelift-tools crate

* Use new import style on remaining files

* run format-all.sh

* run test-all.sh, update Readme and travis ci configuration
fixed an AssertionError also

* Remove deprecated functions

lib/module/Cargo.toml

@@ -8,6 +8,7 @@ documentation = "https://cranelift.readthedocs.io/"
 categories = ["no-std"]
 license = "Apache-2.0 WITH LLVM-exception"
 readme = "README.md"
+edition = "2018"
 
 [dependencies]
 cranelift-codegen = { path = "../codegen", version = "0.26.0", default-features = false }

lib/module/src/backend.rs

@@ -1,13 +1,13 @@
 //! Defines the `Backend` trait.
 
+use crate::DataContext;
+use crate::Linkage;
+use crate::ModuleNamespace;
+use crate::ModuleResult;
 use cranelift_codegen::isa::TargetIsa;
 use cranelift_codegen::Context;
 use cranelift_codegen::{binemit, ir};
 use std::marker;
-use DataContext;
-use Linkage;
-use ModuleNamespace;
-use ModuleResult;
 
 /// A `Backend` implements the functionality needed to support a `Module`.
 ///
@@ -46,7 +46,7 @@ where
     type Product;
 
     /// Create a new `Backend` instance.
-    fn new(Self::Builder) -> Self;
+    fn new(_: Self::Builder) -> Self;
 
     /// Return the `TargetIsa` to compile for.
     fn isa(&self) -> &TargetIsa;

lib/module/src/lib.rs

@@ -29,21 +29,13 @@
 #[cfg_attr(test, macro_use)]
 extern crate alloc;
 
-extern crate cranelift_codegen;
-#[macro_use]
-extern crate cranelift_entity;
-#[macro_use]
-extern crate failure;
-#[macro_use]
-extern crate log;
-
 mod backend;
 mod data_context;
 mod module;
 
-pub use backend::Backend;
-pub use data_context::{DataContext, DataDescription, Init};
-pub use module::{
+pub use crate::backend::Backend;
+pub use crate::data_context::{DataContext, DataDescription, Init};
+pub use crate::module::{
     DataId, FuncId, FuncOrDataId, Linkage, Module, ModuleError, ModuleNamespace, ModuleResult,
 };
 

lib/module/src/module.rs

@@ -5,14 +5,16 @@
 // TODO: Factor out `ir::Function`'s `ext_funcs` and `global_values` into a struct
 // shared with `DataContext`?
 
-use cranelift_codegen::entity::PrimaryMap;
+use crate::data_context::DataContext;
+use crate::Backend;
+use cranelift_codegen::entity::{entity_impl, PrimaryMap};
 use cranelift_codegen::{binemit, ir, isa, CodegenError, Context};
-use data_context::DataContext;
+use failure::Fail;
+use log::info;
 use std::borrow::ToOwned;
 use std::collections::HashMap;
 use std::string::String;
 use std::vec::Vec;
-use Backend;
 
 /// A function identifier for use in the `Module` interface.
 #[derive(Copy, Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]