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will/uniontype.cr

Last active August 29, 2015 14:20
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union type error
Raw
uniontype.cr
alias MyType = Nil | Int32 | String | Bool
foo = [] of MyType
foo << 3
p foo
p foo.first > 1
Raw
z output
Error in ./uniontype.cr:7: undefined method '>' for Nil
p foo.first > 1
^
================================================================================
Nil trace:
/usr/local/Cellar/crystal/0.7.1/src/array.cr:538
def first
^~~~~
/usr/local/Cellar/crystal/0.7.1/src/array.cr:539
first { raise IndexOutOfBounds.new }
^~~~~
/usr/local/Cellar/crystal/0.7.1/src/array.cr:542
def first
^~~~~
/usr/local/Cellar/crystal/0.7.1/src/array.cr:543
@length == 0 ? yield : @buffer[0]
^
/usr/local/Cellar/crystal/0.7.1/src/pointer.cr:91
def [](offset)
^~
/usr/local/Cellar/crystal/0.7.1/src/pointer.cr:92
(self + offset).value
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