Hello everybody,
Today the hat/pin operator (^) only allows the variable as argument, but I
think it would be completely valid for it to allow any expression. This feels
like a natural extension, especially useful when dealing with map fields. The
number of times I tried to write something like that, only to realise it will
fail is "too damn high" :P
assert_received {:foo, ^map.foo}
The obvious fix is to transform this into
foo = map.foo
assert_received {:foo, ^foo}
But I wonder - couldn't this be done automatically by the compiler, to extract
such things from the patterns in order to place them before the case
expression? I could be missing something, especially around some semantic
difference, but I though about this for some time, and couldn't see anything
harmful.
Michał.
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