[Ur] datebox.urp - compiler errors: "unification failure"

[Stefan Scott Alexander]

Searching for an example of a DatePicker, I also found this code, last
updated 3 years ago:

https://github.com/urweb/gui/blob/master/examples/datebox.urp

I tried compiling this, but got some "unification failure" errors (shown at
the end of this message).

I assume this example may be slightly out-of-date, but I'm unsure how to
update it to get it to work.

Thanks for any help!

=== BEGIN COMPILER OUTPUT ===

gui/examples$ urweb datebox

gui/remotePager.ur:16:78: (to 16:80) Unification failure
Expression:  a
  Have con:  transaction {}
  Need con:  <UNIF:U43::Type> -> <UNIF:U44::Type>
Incompatible constructors
Have:  transaction {}
Need:  <UNIF:U43::Type> -> <UNIF:U44::Type>

gui/remotePager.ur:23:71: (to 23:73) Unification failure
Expression:  a
  Have con:  transaction {}
  Need con:  <UNIF:U129::Type> -> <UNIF:U130::Type>
Incompatible constructors
Have:  transaction {}
Need:  <UNIF:U129::Type> -> <UNIF:U130::Type>

gui/remotePager.ur:24:85: (to 24:87) Unification failure
Expression:  a
  Have con:  transaction {}
  Need con:  <UNIF:U204::Type> -> <UNIF:U205::Type>
Incompatible constructors
Have:  transaction {}
Need:  <UNIF:U204::Type> -> <UNIF:U205::Type>

gui/examples$

=== END COMPILER OUTPUT ===

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