Missing declaration with hoist_vars if the variable is redeclared

[kevinptt0323]

Bug report or feature request?

Bug report

ES5 or ES6+ input?

ES5

Uglify version (uglifyjs -V)

uglify-js 3.0.28

JavaScript input

function foo(o) {
    var a = o.a;
    if (a) { return a; }
    else { var a = 1; }
}

The uglifyjs CLI command executed or minify() options used.

uglify in.js -c hoist_vars=true -o out.js

JavaScript output or error produced.

function foo(o){if(a=o.a)return a;a=1}

a is undefined.

[alexlamsl]

@kevinptt0323 thanks for the clear & concise report - fix is on the way 👍