Internal error with missing type signature in interleaved mutual type

[phijor]

Bug

I mistyped a definition and agda crashed with an internal error.

A minimum working (=crashing) example is:

interleaved mutual
  data Foo where -- note the missing signature `: Set`
      bar : Foo

This produced the following error (pointing here):

Checking min (/tmp/min.agda).
An internal error has occurred. Please report this as a bug.
Location of the error: __IMPOSSIBLE__, called at src/full/Agda/Syntax/Concrete/Definitions.hs:851:18 in Agda-2.6.2-5jc1iNTuYyE88p7NRZUfQI:Agda.Syntax.Concrete.Definitions

Without the interleaved mutual block, the above type checks.

Agda version

$ agda --version
Agda version 2.6.2

Related issues

I tried looking for existing issues, maybe this is related to #4881?

[andreasabel]

Thanks for reporting @phijor!
This is already fixed on master:

The following names are defined but not accompanied by a
declaration: Foo

Looks like a duplicate of #5558.
We close issues once they are fixed on master, so if you want to find related issues, you also have to look through the closed ones...