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"if as" syntax
==============
Useful for optional types:
if find_user("admin") as ref User u {
# User found (return value is not none)
...
} else {
# User not found (return value is none)
...
}
This could be extended to support integer overflow handling also:
if might_overflow(a + b) as int i {
...
}
Or even have + do overflow checking if the target type is ?int.
?int c = a + b
if a + b as int i {
...
}
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