Range value analysis for triple operator too

[dlangBugzillaToGithub]

bearophile_hugs reported this on 2013-08-03T03:22:23Z

Transferred from https://issues.dlang.org/show_bug.cgi?id=10749

Description

void main() {
    uint x = 6;
    char digit1 = (x % 10) + '0'; // OK
    char digit2 = (x < 10) ? (x + '0') : '#'; // Error.
}


DMD 2.064alpha gives:

test.d(4): Error: cannot implicitly convert expression (x < 10u ? x + 48u : 35u) of type uint to char

I think the line with digit2 should compile.
(Every useless cast removed from the code reduces the chance of bugs).