When let => var, a scope error can cause the variable to be incorrectly overwritten

[meathill]

Describe the bug

var in block statement will overwrite the variable which has a same name,
defined in identifier label. Like the sample code below. But let won't.
So when convert code like that, please change the variable name to make them
separated.

Input code

let a = 10;
for (let b = 0; b < a; b++) {
    let c = 0, b = 10, d = 100;
    console.log(b);
}

Config

{
  "jsc": {
    "loose": false,
    "externalHelpers": true,
    "parser": {
      "syntax": "ecmascript",
      "jsx": false
    },
    "target": "es5",
    "minify": {
      "compress": false,
      "mangle": false
    }
  },
  "module": {
    "type": "es6"
  },
  "minify": false,
  "isModule": false
}

Playground link

https://play.swc.rs/?version=1.2.118&code=H4sIAAAAAAAAA8tJLVFIVLBVMDSw5uVKyy9S0MgBiiQBRQysgZSNQiKQ0tbWVKjm5VIAApBsMkhWB6zIEEingGmQfpCC5Py84vycVL2c%2FHSNJE2gYC0vFwApdniYZQAAAA%3D%3D&config=H4sIAAAAAAAAA0WNOw4CMQxE7%2BI6LRQ5AQ2HsIJ3FZSfbK%2BUKNq7k0CAdmbemw5PcWA7hJyFwG4YhAxQVeKE4UahEAtY5WPEBVmI51xaUqxggVxEceyLghmuuhSnAUXeSedELqOLPvmtTdblWJhEfm8R0x6%2B5%2BdAY34cM%2BigrdBbcYXz71icl%2FsafsgXAm4Ch80AAAA%3D

Expected behavior

var a = 10;
for(var b = 0; b < a; b++){
    var c = 0, b1 = 10, d = 100;
    console.log(b1);
}

Version

1.2.118

Additional context

No response

[swc-bot]

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