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deleting from map during iteration leads to error #85

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@dominikh

Description

@dominikh

The following code

package main

func main() {
    m := map[int]int{
        1: 1,
        2: 2,
    }

    for k, v := range m {
        _, _ = k, v
        delete(m, k+1)
    }
}

results in

Uncaught TypeError: Cannot read property 'k' of undefined foo.go:9
$packages.main.main foo.go:9
$packages.main.$pkg.$run foo.js:1992
goroutine foo.js:1318
$schedule foo.js:1359
$go foo.js:1348
(anonymous function) foo.go:11
(anonymous function) foo.go:11

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