Swift Playground not showing errors

Question

I am beginning Swift and using tutorials in Swift playgrounds for macOS.

So example code would be

var str = "Hello, playground"
str
str1

I do not get any red error information on the str 1. Just a crash in the console

Playground execution failed: error: MyPlayground.playground:1:1: 
error: use of unresolved identifier 'str1'
str1
^~~~


* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
   * frame #0: 0x0000000102157360 com.apple.dt.Xcode.PlaygroundStub-macosx`executePlayground
     frame #1: 0x000000010215522a com.apple.dt.Xcode.PlaygroundStub-macosx`-[PlaygroundViewBridgeService execute] + 90

If I correct the code then the playground does refresh and show new data it is just not reporting the errors

How do I stop Xcode from crashing and behave as documented?

Xcode Version 8.3 (8E162) macOS 10.12.4

I've tried deleting all Xcode files (including the ones that it creates during a build) and reinstalling and using a different user

Answer 1

Actually a Playground does show the "red mark error on the left side of code" and there's also an automatic option to fix the error, just as regular Projects.

I had the same problem as you (red marks wasn't showing up on the left). What solved for me:

1. Right click the error on Issue Navigator (top left panel)
2. On the Menu > Open As > Quick Look
3. Then do the same command again and Open As > Playground Page

I'm on Xcode 8.3.2

Update: Same is valid for Xcode 9.0

Answer 2

In the issue navigator, right click the error -> open as quick look, then select it back to open as playground. It works for me.

Answer 3

File -> Playground Settings
check show live issues for source code
select show all issues radial button

Xcode was, in fact, as of 3/2017 showing errors inline in the playground, just as it does in a project when editing a file. This behavior changed in a recent update, though I don't see it documented. I assumed it was a bug introduced with the latest patch, or perhaps a default setting was changed that can be changed back.

Edit: In fact, I just opened a playground I created pre-patch, and errors show inline

Settings are