Description

If a user makes a macro with a wild card array and then nests it inside of another macro. The wild card array will throw the following error. This can also happens with a StandardMacro like For Each Loop.

Error The type of Target Array is undetermined. Connect something to "Name of Second Macro" to imply a specific type.

Steps to Reproduce
  1. Open the Editor
  2. Create a new blueprint
  3. Create a macro that uses a wild card array (See attached image EmptyArrayError1)
  4. # Create a macro that uses the first macro (See attached image EmptyArrayError2)
  5. Place the second macro inside of a function (See attached image EmptyArrayError3)
  6. Hit compile
  7. Notice the error that is given and that the "Length" node in the first macro is not receiving array information

Expected: The nested macros would receive array information
Result: Macro throws an error

Alternative repro

  1. Open the Editor
  2. Create a new blueprint
  3. Create a macro that uses a wild card array, and connect it to "For Each Loop"
  4. Call the new macro from the level blueprint -> the blueprint compile fails
  5. Expanding "For Each Loop" macro makes the blueprint compile fine

Have Comments or More Details?

There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-21739 in the post.

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Won't Fix
ComponentUE - Gameplay - Blueprint
Affects Versions4.9.24.184.19
CreatedOct 2, 2015
ResolvedAug 18, 2021
UpdatedAug 18, 2021