On 16/05/2019 21:46, John Rose wrote:
On May 16, 2019, at 1:34 PM, Maurizio Cimadamore
<maurizio.cimadam...@oracle.com> wrote:
On the other hand is a trivial one to resolve, given what we're discussing now
is something like
"yields" EXPRESSION
so, as soon as the compiler sees a "(" it will say: "ok, that's not a new yield
statement".
The tricky bit with that is the user experience. What if the
user needs a parenthesized expression:
yield ("answer is "+x).trim();
There are some sharp edges here.
I was hoping we didn't need to go there :-)
There are other contexts in which we limit what can be done w/r/t/
parenthesized expressions (since these are ambiguous with cast to
generic types). So this looks like another case where the grammar has to
say - sorry no parens here.
Maurizio
Oh, look, it's a workaround bikeshed:
yield false? 0: ("answer is "+x).trim();
yield (String)("answer is "+x);
yield new String[]{ "answer is "+x }[0];
yield Arrays.asList("answer is "+x).get(0);
yield Objects.id("answer is "+x);
And my own little favorite, a bespoke
use of arrow:
yield -> ("answer is "+x);
Maybe then also:
`yield -> { block of stuff to do before I go; YepDone: yield s; };`
— John
