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300 - Discarded the results of top level expression <expression>.
This warning indicates a potential typo or operator precedence error.
The offending statement might be a top-level expression with no side effects. Although this is syntactically correct, this might not be the programmer's intention.
Example
Defective Source
i == j; // The Boolean result of '==' is ignored. Was '=' intended?
Corrected Source
i = j;
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