Brief selection (The GNU Algol 68 Compiler)

### 9.3 Brief selection ¶

It was early recognized that a shorter alternative representation the of-symbol was very much needed, considering the fact the bold version `of` is at least four characters long. This makes certain phrases long and also slightly laborious to read, like in:

    pub op + = (Pos a,b) Pos: (c of a + c of b, r of a + r of b),
           - = (Pos a,b) Pos: (c of a - c of b, r of a - r of b);

This compiler allows using a quote character `'` instead of `of` in selections of structs and multiples. Using this brief style the example above now can be written as:

    pub op + = (Pos a,b) Pos: (c'a + c'b, r'a + r'b),
           - = (Pos a,b) Pos: (c'a - c'b, r'a - r'b);