equal_keys_in_map

Two keys in a map literal shouldn't be equal.

The analyzer produces this diagnostic when a key in a non-constant map is the same as a previous key in the same map. If two keys are the same, then the second value overwrites the first value, which makes having both pairs pointless and likely signals a bug.

The following code produces this diagnostic because the keys a and b have the same value:

const a = 1;
const b = 1;
var m = <int, String>{a: 'a', b: 'b'};

If both entries should be included in the map, then change one of the keys:

const a = 1;
const b = 2;
var m = <int, String>{a: 'a', b: 'b'};

If only one of the entries is needed, then remove the one that isn't needed:

const a = 1;
var m = <int, String>{a: 'a'};

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