Merge branch 'CustomFailReason' into 'master'

Add toString instance for CustomFailReason

See merge request !10
1 job for master in 2 minutes and 2 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #66145
build

00:02:02

 
Name Stage Failure
failed
build Test
[Text.Language.icl,]: no abc file
Compiling 'Text.Language'.
Analyzing 'Testing.JUnitExport'.
[Testing.JUnitExport.icl,]: no abc file
Compiling 'Testing.JUnitExport'.
Error [Testing.JUnitExport.icl,69,<case pattern>]: CustomFailReason not defined
Error [Testing.JUnitExport.icl,69,<case pattern>]: <pattern> (curried) application not allowed
Finished making.
ERROR: Job failed: exit code 1