Method erase

lib/checkunusedvar.cpp:170–172

    VariableUsage *find(nonneg int varid);
    void alias(nonneg int varid1, nonneg int varid2, bool replace);
    void erase(nonneg int varid) {
        mVarUsage.erase(varid);
    }
    void eraseAliases(nonneg int varid);
    void eraseAll(nonneg int varid);
    void clearAliases(nonneg int varid);