jerryscript-project / jerryscript

Ultra-lightweight JavaScript engine for the Internet of Things.
https://jerryscript.net
Apache License 2.0
6.89k stars 669 forks source link

Variable Scope Problem #5024

Open AidPaike opened 1 year ago

AidPaike commented 1 year ago

Version

Version: 3.0.0 ( 6fe763f )

Test case

var foo = function() {
    var y = 200;
    try {
        throw {}
    } catch ({
        x = function(){print(y);}
    }) {
        let y = 300;
        x();
    }
};
foo();

Execution steps

/root/.jsvu/jerry Testcase.js

Output

300

Expected behavior

200

Description

The correct output of the Testcase should be 200 while jerryscript yields 300. The reason I think is that jerryscript fails to deal with the scope of the global and local variables y, where jerryscript may treat the local variable y at line 8 as the global variable, leading to output 300 at line 6.

Looking forward to your reply :)