[Issue 6176] [tdpl] Cannot use string variables in case expressions

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6176



--- Comment #15 from dawg at dawgfoto.de 2012-01-17 19:47:59 PST ---
Some argumentation in favor of a dynamic switch
----
switch (receive(ch0, ch1, ch2))
{
case ch0:
    writeln(ch0.get());
    break;

case ch1:
    writeln(ch1.get());
    break;

case ch2:
    writeln(ch2.get());
    break;

default:
    // error
    break;
}
----
auto token = nextToken();
switch (token)
{
case lastToken:
    break;

case A: .. case B:

}
lastToken = token;
----
switch (str)
{
case re("[f|b]oo"):

case re("[f|b]ar"):

case re("[f|b]az"):
}
----

This can definitely become very confusing, e.g. when the
comparison has the side-effect of changing another case label.

To make it complete a dynamic case statement should be a boolean
expressions probably involving the expression being switch on,
i.e. the perfect dynamic switch is an "if-else" chain.

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