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project('plusassign', 'c')
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x = []
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x += 'a'
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if x.length() != 1
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error('Incorrect append')
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endif
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if x[0] != 'a'
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error('Incorrect append 2.')
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endif
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y = x
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x += 'b'
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if y.length() != 1
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error('Immutability broken.')
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endif
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if y[0] != 'a'
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error('Immutability broken 2.')
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endif
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if x.length() != 2
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error('Incorrect append 3')
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endif
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if x[0] != 'a'
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error('Incorrect append 4.')
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endif
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if x[1] != 'b'
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error('Incorrect append 5.')
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endif
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# Now with evil added: append yourself.
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x += x
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if x.length() != 4
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error('Incorrect selfappend.')
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endif
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