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improve error message when a label instance is not available #44

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Merged
benikm91 merged 2 commits into from
Jan 20, 2026
Merged

improve error message when a label instance is not available #44

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5017ab7
improve error message when a label instance is not available
marcelluethi Jan 18, 2026
e5677cc
simplify error message missing label implicit
marcelluethi Jan 20, 2026
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9 changes: 9 additions & 0 deletions core/src/main/scala/dimwit/tensor/Labels.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,10 @@ package dimwit.tensor
import scala.compiletime.*
import scala.quoted.*

@scala.annotation.implicitNotFound("""
An axis label ${T} was given or inferred, which does not have a Label instance.
Ensure that all axis types ${T} are defined with 'derives Label' (e.g. 'trait T derives Label')
""")
trait Label[T]:
def name: String

Expand All @@ -18,6 +22,11 @@ object Label:
def name: String = ${ Expr(simpleName) }
}

@scala.annotation.implicitNotFound("""
A tuple of axis labels ${T} was given or inferred that does not have a valid Labels instance.

Ensure that all of the types in the tuple have a 'derives Label' clause.
""")
trait Labels[T]:
def names: List[String]

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