I question the need of rule 10.6

[jbezem]

result = -1 - 10;

First, the '-1' is not a constant, but a unary minus operator with a constant. Negative constant literals do not exist in C, AFAIK.

Though perhaps there exists a case when the lack of this suffix will lead to bugs? If not, I don't see any reasons keeping this rule.

You may be interested to check my blog post here http://www.bezem.de/2009/03/why-32768-is...as-0x8000/.
The example might look a little constructed, but this issue actually occured in software I am responsible for, even though the given example was modified in some ways on extraction from the real code. The discrepancy is apparent from 32768 to 65535 inclusive, and also exists in C99 between long and long long constants.

In this context, I'm absolutely against removing rule 10.6.

BR,

Johan