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serenity/Libraries/LibJS/Tests/functions
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Linus Groh dca9e4ec10 LibJS: Implement rules for duplicate function parameters 
- A regular function can have duplicate parameters except in strict mode
  or if its parameter list is not "simple" (has a default or rest
  parameter)
- An arrow function can never have duplicate parameters

Compared to other engines I opted for more useful syntax error messages
than a generic "duplicate parameter name not allowed in this context":

    "use strict"; function test(foo, foo) {}
                                     ^
    Uncaught exception: [SyntaxError]: Duplicate parameter 'foo' not allowed in strict mode (line: 1, column: 34)

    function test(foo, foo = 1) {}
                       ^
    Uncaught exception: [SyntaxError]: Duplicate parameter 'foo' not allowed in function with default parameter (line: 1, column: 20)

    function test(foo, ...foo) {}
                          ^
    Uncaught exception: [SyntaxError]: Duplicate parameter 'foo' not allowed in function with rest parameter (line: 1, column: 23)

    (foo, foo) => {}
          ^
    Uncaught exception: [SyntaxError]: Duplicate parameter 'foo' not allowed in arrow function (line: 1, column: 7)
2020-10-25 12:56:02 +01:00
..
arrow-functions.js LibJS: Don't parse arrow function with newline between ) and => 2020-10-19 11:31:55 +02:00
constructor-basic.js LibJS: Indent tests with 4 spaces instead of 2 2020-07-06 23:40:35 +02:00
function-default-parameters.js Everywhere: Fix typos 2020-10-02 16:03:17 +02:00
function-duplicate-parameters.js LibJS: Implement rules for duplicate function parameters 2020-10-25 12:56:02 +01:00
function-hoisting.js LibJS: Indent tests with 4 spaces instead of 2 2020-07-06 23:40:35 +02:00
function-length.js LibJS: Indent tests with 4 spaces instead of 2 2020-07-06 23:40:35 +02:00
function-missing-arg.js LibJS: Indent tests with 4 spaces instead of 2 2020-07-06 23:40:35 +02:00
function-name.js LibJS: Do not revisit already visited values in update_function_name() 2020-09-19 00:33:56 +02:00
function-rest-params.js LibJS: Indent tests with 4 spaces instead of 2 2020-07-06 23:40:35 +02:00
function-spread.js LibJS: Integrate iterator protocol into language features 2020-07-14 17:58:42 +02:00
function-strict-mode.js Everywhere: Fix typos 2020-10-02 16:03:17 +02:00
function-this-in-arguments.js LibJS: Indent tests with 4 spaces instead of 2 2020-07-06 23:40:35 +02:00
function-TypeError.js LibJS: Indent tests with 4 spaces instead of 2 2020-07-06 23:40:35 +02:00