Conditionals or declarations in ForEach broke with Xcode 12 (non-beta)?

I just updated to the freshly minted Xcode 12 release, and rebuilt my SwiftUI project... and now all the places I use conditionals or declare variables in ForEach in a View aren't compiling anymore. This was working fine through all of the betas. Has anyone else seen this?
Also, I used to be able to have multiple sections in the body of a view, but now I cannot? Wrapping them in a VStack or something else seems to make that compile, but then they don't look right anymore.

Conditionals or declarations in ForEach broke with Xcode 12 (non-beta)?
 
 
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