Unicode block for programming related symbols and codepoints?

[Hans Aberg]

> On 9 Feb 2015, at 22:07, Jean-François Colson <jf at colson.eu> wrote:

>> > But if a left arrow, for example, might be a better choice for an assignment
>> > operator in a programming language, and a two-character ASCII operator
>> > like ":=" or "<-" doesn't seem appropriate or causes other confusion, there
>> > still isn't a character *encoding* issue here. Just use "←", which already exists (U+2190),
>> > and is a fine left arrow!
>> 
>> There are also
>>   ≔ COLON EQUALS U+2254
>> and others.
>> 
>> No problems using such characters in Flex:
>> 
>> The problem is the lack of input methods. 
> 
> No problem for me: I can input a ← by typing either Alt Gr + 4 (on the numeric keypad) or compose +  < + -
> I have no way to type "colon equals" but to type it as compose + : + = I should simply add one single line to my ~/.XCompose file:
> <Multi_key> <colon> <equal> : U2254
> and restart my text editor. That isn't more difficult than that.

The problem is that there are a lot of characters and rather time consuming to design ones own input methods.