[#BOO-809] Compiler error when overriding virtua generator method

Boo

Compiler error when overriding virtua generator method

Created: 12/Mar/07 04:02 PM Updated: 04/May/07 04:53 AM

Component/s:

None

Affects Version/s:

0.7.6

Fix Version/s:

0.7.7

Time Tracking:

Not Specified

Testcase included:

yes

Description

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class sgroup:
pass

class state:
public type as sgroup

virtual def GetTypes():
yield type

class state1(state):

public type1 as sgroup

def GetTypes():
yield type1

Error: The return type of a generator must be either
'System.Collections.IEnumerable' or 'object'. (BCE0101)

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Rodrigo B. de Oliveira - 12/Mar/07 04:03 PM

The workaround is to explicilty declare the return type of the virtual method as System.Collections.IEnumerable.

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Avishay Lavie - 04/May/07 04:53 AM

Fixed in 2470: generators with unknown return types are now assumed to return IEnumerable or IEnumerable of YieldType, instead of the specific compiler-generated type. This allows overriding methods to specify the same return type or no return type (it will be correctly inferred).