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undefined_identifier

Undefined name '{0}'.

Description

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The analyzer produces this diagnostic when it encounters an identifier that either isn't defined or isn't visible in the scope in which it's being referenced.

Example

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The following code produces this diagnostic because the name rihgt isn't defined:

dart
int min(int left, int right) => left <= rihgt ? left : right;

Common fixes

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If the identifier isn't defined, then either define it or replace it with an identifier that is defined. The example above can be corrected by fixing the spelling of the variable:

dart
int min(int left, int right) => left <= right ? left : right;

If the identifier is defined but isn't visible, then you probably need to add an import or re-arrange your code to make the identifier visible.