Use the Self keyword where applicable.

https://github.com/rust-lang-nursery/rust-clippy/wiki#use_self

lib/frontend/src/frontend.rs

@@ -51,8 +51,8 @@ where
 {
     /// Creates a ILBuilder structure. The structure is automatically cleared each time it is
     /// passed to a [`FunctionBuilder`](struct.FunctionBuilder.html) for creation.
-    pub fn new() -> ILBuilder<Variable> {
-        ILBuilder {
+    pub fn new() -> Self {
+        Self {
             ssa: SSABuilder::new(),
             ebbs: EntityMap::new(),
             types: EntityMap::new(),

lib/frontend/src/ssa.rs

@@ -128,7 +128,7 @@ impl EntityRef for Block {
 }
 
 impl ReservedValue for Block {
-    fn reserved_value() -> Block {
+    fn reserved_value() -> Self {
         Block(u32::MAX)
     }
 }
@@ -138,8 +138,8 @@ where
     Variable: EntityRef + Default,
 {
     /// Allocate a new blank SSA builder struct. Use the API function to interact with the struct.
-    pub fn new() -> SSABuilder<Variable> {
-        SSABuilder {
+    pub fn new() -> Self {
+        Self {
             variables: EntityMap::new(),
             blocks: PrimaryMap::new(),
             ebb_headers: EntityMap::new(),

lib/reader/src/sourcemap.rs

@@ -185,8 +185,8 @@ pub trait MutableSourceMap {
 }
 
 impl MutableSourceMap for SourceMap {
-    fn new() -> SourceMap {
-        SourceMap {
+    fn new() -> Self {
+        Self {
             values: HashMap::new(),
             ebbs: HashMap::new(),
             stack_slots: HashMap::new(),

lib/wasm/src/code_translator.rs

@@ -144,8 +144,8 @@ pub struct FunctionImports {
 }
 
 impl FunctionImports {
-    fn new() -> FunctionImports {
-        FunctionImports {
+    fn new() -> Self {
+        Self {
             functions: HashMap::new(),
             signatures: HashMap::new(),
         }

lib/wasm/src/module_translator.rs

@@ -46,8 +46,8 @@ pub struct ImportMappings {
 
 impl ImportMappings {
     /// Create a new empty `ImportMappings`.
-    pub fn new() -> ImportMappings {
-        ImportMappings {
+    pub fn new() -> Self {
+        Self {
             functions: HashMap::new(),
             signatures: HashMap::new(),
         }

lib/wasm/src/runtime/dummy.rs

@@ -15,8 +15,8 @@ pub struct DummyRuntime {
 
 impl DummyRuntime {
     /// Allocates the runtime data structures.
-    pub fn new() -> DummyRuntime {
-        DummyRuntime { globals: Vec::new() }
+    pub fn new() -> Self {
+        Self { globals: Vec::new() }
     }
 }
 

lib/wasm/src/translation_utils.rs

@@ -98,7 +98,7 @@ impl cretonne::entity::EntityRef for Local {
     }
 }
 impl Default for Local {
-    fn default() -> Local {
+    fn default() -> Self {
         Local(u32::MAX)
     }
 }