diff --git a/lib/reader/src/parser.rs b/lib/reader/src/parser.rs
index 641fe2a89d..e1cc270c60 100644
--- a/lib/reader/src/parser.rs
+++ b/lib/reader/src/parser.rs
@@ -197,7 +197,7 @@ impl<'a> Context<'a> {
     }
 
     // Resolve a reference to a signature.
-    fn check_sig(&self, sig: SigRef, loc: &Location) -> ParseResult<()> {
+    fn check_sig(&self, sig: SigRef, loc: Location) -> ParseResult<()> {
         if !self.map.contains_sig(sig) {
             err!(loc, "undefined signature {}", sig)
         } else {
@@ -1246,7 +1246,7 @@ impl<'a> Parser<'a> {
                     }
                     Some(sig) => sig,
                 };
-                ctx.check_sig(sig, &self.loc)?;
+                ctx.check_sig(sig, self.loc)?;
                 self.consume();
                 ExtFuncData {
                     name,
@@ -2096,7 +2096,7 @@ impl<'a> Parser<'a> {
             }
             InstructionFormat::CallIndirect => {
                 let sig_ref = self.match_sig("expected signature reference")?;
-                ctx.check_sig(sig_ref, &self.loc)?;
+                ctx.check_sig(sig_ref, self.loc)?;
                 self.match_token(Token::Comma, "expected ',' between operands")?;
                 let callee = self.match_value("expected SSA value callee operand")?;
                 self.match_token(Token::LPar, "expected '(' before arguments")?;
diff --git a/lib/wasm/src/code_translator.rs b/lib/wasm/src/code_translator.rs
index e6018a11bb..dc9be39fa5 100644
--- a/lib/wasm/src/code_translator.rs
+++ b/lib/wasm/src/code_translator.rs
@@ -129,7 +129,7 @@ pub fn translate_operator<FE: FuncEnvironment + ?Sized>(
          ***********************************************************************************/
         Operator::Block { ty } => {
             let next = builder.create_ebb();
-            if let Ok(ty_cre) = type_to_type(&ty) {
+            if let Ok(ty_cre) = type_to_type(ty) {
                 builder.append_ebb_param(next, ty_cre);
             }
             state.push_block(next, num_return_values(ty));
@@ -137,7 +137,7 @@ pub fn translate_operator<FE: FuncEnvironment + ?Sized>(
         Operator::Loop { ty } => {
             let loop_body = builder.create_ebb();
             let next = builder.create_ebb();
-            if let Ok(ty_cre) = type_to_type(&ty) {
+            if let Ok(ty_cre) = type_to_type(ty) {
                 builder.append_ebb_param(next, ty_cre);
             }
             builder.ins().jump(loop_body, &[]);
@@ -155,7 +155,7 @@ pub fn translate_operator<FE: FuncEnvironment + ?Sized>(
             //   and we add nothing;
             // - either the If have an Else clause, in that case the destination of this jump
             //   instruction will be changed later when we translate the Else operator.
-            if let Ok(ty_cre) = type_to_type(&ty) {
+            if let Ok(ty_cre) = type_to_type(ty) {
                 builder.append_ebb_param(if_not, ty_cre);
             }
             state.push_if(jump_inst, if_not, num_return_values(ty));
diff --git a/lib/wasm/src/sections_translator.rs b/lib/wasm/src/sections_translator.rs
index 0c47a3e940..c21dbb0c25 100644
--- a/lib/wasm/src/sections_translator.rs
+++ b/lib/wasm/src/sections_translator.rs
@@ -36,12 +36,12 @@ pub fn parse_function_signatures(
             }) => {
                 let mut sig = Signature::new(environ.flags().call_conv());
                 sig.params.extend(params.iter().map(|ty| {
-                    let cret_arg: ir::Type = type_to_type(ty)
+                    let cret_arg: ir::Type = type_to_type(*ty)
                         .expect("only numeric types are supported in function signatures");
                     AbiParam::new(cret_arg)
                 }));
                 sig.returns.extend(returns.iter().map(|ty| {
-                    let cret_arg: ir::Type = type_to_type(ty)
+                    let cret_arg: ir::Type = type_to_type(*ty)
                         .expect("only numeric types are supported in function signatures");
                     AbiParam::new(cret_arg)
                 }));
@@ -92,7 +92,7 @@ pub fn parse_import_section<'data>(
                 ..
             } => {
                 environ.declare_global(Global {
-                    ty: type_to_type(&ty.content_type).unwrap(),
+                    ty: type_to_type(ty.content_type).unwrap(),
                     mutability: ty.mutable,
                     initializer: GlobalInit::Import(),
                 });
@@ -101,7 +101,7 @@ pub fn parse_import_section<'data>(
                 ty: ImportSectionEntryType::Table(ref tab),
                 ..
             } => environ.declare_table(Table {
-                ty: match type_to_type(&tab.element_type) {
+                ty: match type_to_type(tab.element_type) {
                     Ok(t) => TableElementType::Val(t),
                     Err(()) => TableElementType::Func(),
                 },
@@ -245,7 +245,7 @@ pub fn parse_global_section(
             ref s => panic!("unexpected section content: {:?}", s),
         }
         let global = Global {
-            ty: type_to_type(&content_type).unwrap(),
+            ty: type_to_type(content_type).unwrap(),
             mutability,
             initializer,
         };
@@ -329,7 +329,7 @@ pub fn parse_table_section(parser: &mut Parser, environ: &mut ModuleEnvironment)
     loop {
         match *parser.read() {
             ParserState::TableSectionEntry(ref table) => environ.declare_table(Table {
-                ty: match type_to_type(&table.element_type) {
+                ty: match type_to_type(table.element_type) {
                     Ok(t) => TableElementType::Val(t),
                     Err(()) => TableElementType::Func(),
                 },
diff --git a/lib/wasm/src/translation_utils.rs b/lib/wasm/src/translation_utils.rs
index 3ed13899e6..16b5737b80 100644
--- a/lib/wasm/src/translation_utils.rs
+++ b/lib/wasm/src/translation_utils.rs
@@ -72,8 +72,8 @@ pub struct Memory {
 }
 
 /// Helper function translating wasmparser types to Cretonne types when possible.
-pub fn type_to_type(ty: &wasmparser::Type) -> Result<ir::Type, ()> {
-    match *ty {
+pub fn type_to_type(ty: wasmparser::Type) -> Result<ir::Type, ()> {
+    match ty {
         wasmparser::Type::I32 => Ok(ir::types::I32),
         wasmparser::Type::I64 => Ok(ir::types::I64),
         wasmparser::Type::F32 => Ok(ir::types::F32),