TIL: statically initializing an Associative Array

[Andy Valencia]

I had a set of default error messages to go with error code 
numbers, and did something along the lines of:

string[uint] error_text = [
     400: "A message",
     401: "A different message"
];

and got "expression .... is not a constant"

I eventually found this discussion:
     https://issues.dlang.org/show_bug.cgi?id=6238

I understand that it's problematic, but a message which makes it 
clearer that compile-time initialization of global AA's are not 
supported?  Because it cost me about a half hour trying to figure 
out what I was doing wrong.

(My workaround was to initialize the data structure once during 
app startup.)