Re: unexpected syntax error

[Rob Kendrick <rjek@...>]

On Wed, Nov 28, 2012 at 05:17:28PM +0100, Matthias Kluwe wrote:
> Hi!
> 
> I played around trying to create a small DSL and stumbled upon an
> unexpected behaviour. This is a small example:
> 
> local function f()
>     return setmetatable( {}, {
>         __div = function( t, arg )
>             print( arg )
>         end } )
> end
> 
> f{} / 'a'

That's because this is an expression, not a statement.  It doesn't work
as f() / 42, either.  You need to specify where to put the result, or
use it in a flow control structure.

> I get the error message "unexpected symbol near '/'".
> 
> Surprisingly, the following prints 'a':
> 
> (function() end)( f{} / 'a' )

Not to me: this is a statement that calls a function, passing in the
result of an expression.

B.