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Add rescue to support streamline error handling #7038

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Merged
merged 4 commits into from
Aug 27, 2019
Merged

Add rescue to support streamline error handling #7038

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bf37dce
Add rescue to support streamline error handling
liufengyun Aug 14, 2019
b96a908
add test for partial function handler
liufengyun Aug 14, 2019
910f6b3
Use partial functions in interface (thanks @smarter)
liufengyun Aug 14, 2019
d31a8bb
Only rescue non-fatal errors
liufengyun Aug 14, 2019
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18 changes: 18 additions & 0 deletions tests/run/rescue.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,18 @@
object lib {
inline def (op: => T) rescue[T] (fallback: => T) = try op catch { case _: Throwable => fallback }
inline def (op: => T) rescue[T, E <: Throwable] (fallback: E => T) = try op catch { case ex: E => fallback(ex) }
}

import lib._

@main def Test = {
assert((9 / 1 rescue 1) == 9)
assert((9 / 0 rescue 1) == 1)
assert(((9 / 0 rescue { ex: NullPointerException => 5 }) rescue 10) == 10)
assert(((9 / 0 rescue { ex: ArithmeticException => 5 }) rescue 10) == 5)

assert((9 / 0 rescue {
case ex: NullPointerException => 4
case ex: ArithmeticException => 3
}) == 3)
}