interp: improve handling of empty interface values #1393
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At variable, function parameter, slice, map or field element assign, if the destination type is an empty interface, the value was never wrapped into a valueInterface (to preserve type mutability in case of re-assign). Now we wrap it in a valueInterface if the source type has a non empty set of methods, to allow a future use as a non empty interface. There are still corner cases, but it extends notably the support of interfaces within the interpreter. Fixes traefik#1355.
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Yes, the issue is testing only function call, but we have to cover consistently (at least for maintainability) the other possible cases where an interpreter non empty interface value can be assigned to an empty interface value. I agree that we may miss unit tests for those cases. |
mpl
approved these changes
May 19, 2022
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At variable, function parameter, slice, map or field element assign,
if the destination type is an empty interface, the value was never
wrapped into a valueInterface (to preserve type mutability in case
of re-assign). Now we wrap it in a valueInterface if the source
type has a non empty set of methods, to allow a future use as a non
empty interface.
There are still corner cases, but it extends notably the support
of interfaces within the interpreter.
Fixes #1355.