[Issue 15749] New: allow `with` on an expression

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=15749

          Issue ID: 15749
           Summary: allow `with` on an expression
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: john.loughran.colvin at gmail.com

The motivation is stuff like this:

zip(iota(10), iota(10, 20))
.map!(t => Tuple!(int, "a", int, "b)(t))
.map!(t => with(t) a + b);

which, short of having some proper tuple unpacking syntax (that would be so, so
good), is nicer than the current

.map!((t) { with(t) return a + b; });

that might seem like a small change, but I'm having a hard time selling D and
functional programming to scientists with all the heavyweight syntax, they are
spoiled by the inefficient but neat-looking numpy model.

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