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- discard """
- output: '''@[1, 2, 3]
- @[4.0, 5.0, 6.0]
- @[1, 2, 3]
- @[4.0, 5.0, 6.0]
- @[1, 2, 3]
- @[4, 5, 6]'''
- """
- # bug #3476
- proc foo[T]: var seq[T] =
- ## Problem! Bug with generics makes every call to this proc generate
- ## a new seq[T] instead of retrieving the `items {.global.}` variable.
- var items {.global.}: seq[T]
- return items
- proc foo2[T]: ptr seq[T] =
- ## Workaround! By returning by `ptr` instead of `var` we can get access to
- ## the `items` variable, but that means we have to explicitly deref at callsite.
- var items {.global.}: seq[T]
- return addr items
- proc bar[T]: var seq[int] =
- ## Proof. This proc correctly retrieves the `items` variable. Notice the only thing
- ## that's changed from `foo` is that it returns `seq[int]` instead of `seq[T]`.
- var items {.global.}: seq[int]
- return items
- foo[int]() = @[1, 2, 3]
- foo[float]() = @[4.0, 5.0, 6.0]
- foo2[int]()[] = @[1, 2, 3]
- foo2[float]()[] = @[4.0, 5.0, 6.0]
- bar[int]() = @[1, 2, 3]
- bar[float]() = @[4, 5, 6]
- echo foo[int]() # prints 'nil' - BUG!
- echo foo[float]() # prints 'nil' - BUG!
- echo foo2[int]()[] # prints '@[1, 2, 3]'
- echo foo2[float]()[] # prints '@[4.0, 5.0, 6.0]'
- echo bar[int]() # prints '@[1, 2, 3]'
- echo bar[float]() # prints '@[4, 5, 6]'
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