Last active
August 29, 2015 14:05
-
-
Save bvenners/67cb4e8c0b285ca99fa3 to your computer and use it in GitHub Desktop.
Getting a Scala compiler error when needed typeclass coherency is missing
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| scala> import org.scalactic._ | |
| import org.scalactic._ | |
| scala> val lower = EquiSets[String](StringNormalizations.lowerCased.toHashingEquality) | |
| lower: org.scalactic.EquiSets[String] = EquiSets(NormalizingHashingEquality(lowerCased)) | |
| scala> val trimmed = EquiSets[String](StringNormalizations.trimmed.toHashingEquality) | |
| trimmed: org.scalactic.EquiSets[String] = EquiSets(NormalizingHashingEquality(trimmed)) | |
| scala> val hiho = lower.EquiSet("hi", "ho") | |
| hiho: lower.EquiSet = EquiSet(hi, ho) | |
| scala> hiho + "HI" | |
| res0: lower.EquiSet = EquiSet(hi, ho) | |
| scala> hiho + "Hi" | |
| res1: lower.EquiSet = EquiSet(hi, ho) | |
| scala> val hihoha = hiho + "ha" | |
| hihoha: lower.EquiSet = EquiSet(hi, ho, ha) | |
| scala> val HIHO = lower.EquiSet("HI", "HO") | |
| HIHO: lower.EquiSet = EquiSet(HI, HO) | |
| scala> HIHO + "hi" | |
| res2: lower.EquiSet = EquiSet(HI, HO) | |
| scala> HIHO + "Hi" | |
| res3: lower.EquiSet = EquiSet(HI, HO) | |
| scala> HIHO union hihoha | |
| res4: lower.EquiSet = EquiSet(HI, HO, ha) | |
| scala> hihoha union HIHO | |
| res5: lower.EquiSet = EquiSet(hi, ho, ha) | |
| scala> val bilbo = trimmed.EquiSet("bil", "bo") | |
| bilbo: trimmed.EquiSet = EquiSet(bil, bo) | |
| scala> bilbo + " bo " | |
| res6: trimmed.EquiSet = EquiSet(bil, bo) | |
| scala> bilbo + " bil " | |
| res7: trimmed.EquiSet = EquiSet(bil, bo) | |
| scala> val baggins = trimmed.EquiSet(" bag", "gins ") | |
| baggins: trimmed.EquiSet = EquiSet( bag, gins ) | |
| scala> baggins + "bag" | |
| res8: trimmed.EquiSet = EquiSet( bag, gins ) | |
| scala> baggins + "gins" | |
| res9: trimmed.EquiSet = EquiSet( bag, gins ) | |
| scala> bilbo union baggins | |
| res10: trimmed.EquiSet = EquiSet(bil, bo, bag, gins ) | |
| scala> val bilboBaggins = trimmed.EquiSet(" bil ", " bo", " Baggins ") | |
| bilboBaggins: trimmed.EquiSet = EquiSet( bil , bo, Baggins ) | |
| scala> bilbo union bilboBaggins | |
| res11: trimmed.EquiSet = EquiSet(bil, bo, Baggins ) | |
| scala> bilboBaggins union bilbo | |
| res12: trimmed.EquiSet = EquiSet( bil , bo, Baggins ) | |
| scala> bilbo union hiho | |
| <console>:24: error: type mismatch; | |
| found : lower.EquiSet | |
| required: trimmed.EquiSet | |
| bilbo union hiho | |
| ^ |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment