Respect rust 1.56 (#1681)

* Style: Respect rust1.56

* Chore: Change to 2021 edition

boa/Cargo.toml

@@ -8,7 +8,7 @@ keywords = ["javascript", "compiler", "lexer", "parser", "js"]
 categories = ["parser-implementations", "wasm"]
 license = "Unlicense/MIT"
 exclude = ["../.vscode/*", "../Dockerfile", "../Makefile", "../.editorConfig"]
-edition = "2018"
+edition = "2021"
 
 [features]
 profiler = ["measureme"]

boa/src/builtins/bigint/mod.rs

@@ -259,8 +259,6 @@ impl BigInt {
     /// Additionally to the wrapped unsigned value it returns the converted `bits` argument, so it
     /// can be reused from the `as_int_n` method.
     fn calculate_as_uint_n(args: &[JsValue], context: &mut Context) -> JsResult<(JsBigInt, u32)> {
-        use std::convert::TryFrom;
-
         let bits_arg = args.get_or_undefined(0);
         let bigint_arg = args.get_or_undefined(1);
 

boa/src/syntax/parser/expression/assignment/yield.rs

@@ -74,16 +74,10 @@ where
             if let TokenKind::Punctuator(Punctuator::Mul) = next_token.kind() {
                 cursor.expect(TokenKind::Punctuator(Punctuator::Mul), "token disappeared")?;
                 delegate = true;
-                expr = Some(
-                    AssignmentExpression::new(self.allow_in, true, self.allow_await)
-                        .parse(cursor)?,
-                );
-            } else {
-                expr = Some(
-                    AssignmentExpression::new(self.allow_in, true, self.allow_await)
-                        .parse(cursor)?,
-                );
             }
+            expr = Some(
+                AssignmentExpression::new(self.allow_in, true, self.allow_await).parse(cursor)?,
+            );
         }
 
         Ok(Node::Yield(Yield::new::<Node, Option<Node>>(

boa_cli/Cargo.toml

@@ -8,7 +8,7 @@ keywords = ["javascript", "compiler", "lexer", "parser", "js", "cli"]
 categories = ["command-line-utilities"]
 license = "Unlicense/MIT"
 exclude = ["../.vscode/*", "../Dockerfile", "../Makefile", "../.editorConfig"]
-edition = "2018"
+edition = "2021"
 default-run = "boa"
 
 [dependencies]

boa_tester/Cargo.toml

@@ -8,7 +8,7 @@ keywords = ["javascript", "compiler", "test262", "tester", "js"]
 categories = ["parser-implementations", "wasm"]
 license = "Unlicense/MIT"
 exclude = ["../.vscode/*", "../Dockerfile", "../Makefile", "../.editorConfig"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 Boa = { path = "../boa" }

boa_unicode/Cargo.toml

@@ -8,7 +8,7 @@ keywords = ["javascript", "compiler", "lexer", "parser", "unicode"]
 categories = ["parsing"]
 license = "Unlicense/MIT"
 exclude = ["../.vscode/*", "../Dockerfile", "../Makefile", "../.editorConfig"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 unicode-general-category = "0.4.0"

boa_wasm/Cargo.toml

@@ -8,7 +8,7 @@ keywords = ["javascript", "compiler", "lexer", "parser", "js"]
 categories = ["wasm"]
 license = "Unlicense/MIT"
 exclude = ["../.vscode/*", "../Dockerfile", "../Makefile", "../.editorConfig"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 Boa = { path = "../boa", features = ["console"] }