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improved phantom type message

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Folkert 2020-04-14 21:27:29 +02:00
parent 7e4a1ef4bd
commit c42b5a1e5b
2 changed files with 10 additions and 2 deletions
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7
compiler/reporting/src/report.rs
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@ -425,7 +425,12 @@ pub fn can_problem<'b>(
alloc.reflow(" alias definition:"),
]),
alloc.region(variable_region),
alloc.reflow("Roc does not allow phantom type parameters!"),
alloc.reflow("Roc does not allow unused type parameters!"),
// TODO add link to this guide section
alloc.hint().append(alloc.reflow(
"If you want an unused type parameter (a so-called \"phantom type\"), \
read the guide section on phantom data.",
)),
]),
Problem::DuplicateRecordFieldValue {
field_name,