[cfe-dev] check an AST node's parent node ?

[kevinlynx]

In my coding standard checking tool, it limits comma expression usage, except in a for statment, i.e:

    x++, x+=1; // this will be marked as invalid usage
    for (x = 0, y = 0; ...) // but this comma expression is valid

I can implement `VisitBinComma`, this function will be called when parsed comma expression. But how to know if this comma expression is in a for statment ?

Thanks.
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