- Allow this for both argument lists and block arguments.
- Tweak precedence to make "." higher than infix "{}" to avoid a
class body being parsed as the superclass clause's block argument.
- Convert all uses of ".call" to use this. (There was not a single
case in the repo that ran into the getter ambiguity.)
This fixes the nasty case where "foo(bar)" is context-sensitive, and
generally simplifies the compiler a lot since there is a clear
distinction between lexical and dynamic scope.
Also:
- Remove the special handling of capitalized names since all names are
lexical now.
- Allow methods to close over local variables in enclosing functions.
- Allow implicit definition of all lexical names.
This allows "%(...)" inside a string literal to interpolate the
stringified result of an expression.
It doesn't support custom interpolators or format strings, but we can
consider extending that later.
Get rid of the separate opt-in IO class and replace it with a core
System class.
- Remove wren_io.c, wren_io.h, and io.wren.
- Remove the flags that disable it.
- Remove the overloads for print() with different arity. (It was an
experiment, but I don't think it's that useful.)
- Remove IO.read(). That will reappear using libuv in the CLI at some
point.
- Remove IO.time. Doesn't seem to have been used.
- Update all of the tests, docs, etc.
I'm sorry for all the breakage this causes, but I think "System" is a
better name for this class (it makes it natural to add things like
"System.gc()") and frees up "IO" for referring to the CLI's IO module.
* Eliminate "new" reserved word.
* Allow "this" before a method definition to define a constructor.
* Only create a default constructor for classes that don't define one.
