SyntaxError: Identifier 'word' has already been declared

[kofifus]

>lebab fes6.js -o fes6.js --transform template
C:\Users\AppData\Roaming\npm\node_modules\lebab\node_modules\espree\espree.js:441
        throw err;
        ^

SyntaxError: Identifier 'word' has already been declared
    at Parser.instance.raise.instance.raiseRecoverable (C:\Users\AppData\Roaming\npm\node_modules\lebab\node_modules\espree\espree.js:437:19)
    at Parser.pp$2.checkLVal (C:\Users\AppData\Roaming\npm\node_modules\lebab\node_modules\acorn\dist\acorn.js:1651:14)
    at Parser.checkLVal (C:\Users\AppData\Roaming\npm\node_modules\lebab\node_modules\espree\espree.js:285:30)
    at Parser.pp$1.parseVarId (C:\Users\AppData\Roaming\npm\node_modules\lebab\node_modules\acorn\dist\acorn.js:1132:8)
    at Parser.pp$1.parseVar (C:\Users\AppData\Roaming\npm\node_modules\lebab\node_modules\acorn\dist\acorn.js:1114:12)
    at Parser.pp$1.parseVarStatement (C:\Users\AppData\Roaming\npm\node_modules\lebab\node_modules\acorn\dist\acorn.js:992:8)
    at Parser.pp$1.parseStatement (C:\Users\AppData\Roaming\npm\node_modules\lebab\node_modules\acorn\dist\acorn.js:764:17)
    at Parser.pp$1.parseBlock (C:\Users\AppData\Roaming\npm\node_modules\lebab\node_modules\acorn\dist\acorn.js:1064:23)
    at Parser.pp$3.parseFunctionBody (C:\Users\AppData\Roaming\npm\node_modules\lebab\node_modules\acorn\dist\acorn.js:2426:22)
    at Parser.pp$1.parseFunction (C:\Users\AppData\Roaming\npm\node_modules\lebab\node_modules\acorn\dist\acorn.js:1165:8)

This seems to happen for the next transform running after 'let'

[nene]

Thanks for the report. Please include a code snippet which you're trying to transform, that causes the crash.

[nene]

Having received no further information for several months, I'm closing this.

[IlyaGulya]

Hello @nene!
Here's simple snippet which causes espree to fail during parsing:

function testFn(e, t) {
}

var testFn

[nene]

Thanks.

[nene]

Unfortunatly not much I can do about this as this is a problem in espree parser.