parse for statements

[degory]

statement will be a foreach, i.e. new syntax

for i in 0..9 do
    IO.Std.err.println("blah");
od

is equivalent to old L syntax

foreach var i; 0..9 do
    IO.Std.err.println("blah");
od

Note

• No explicit var - loop variable is auto-declared let, scoped to body of loop
• If concerned about efficiency, could recognise range constructor as a special case.
• Either no support for C style for, or differentiate it by presence of semicolons