Std.Result.mapErr

fn

This is a callable function.

What it does

The failure transformed, if there was one.

This is how a caller adapts one module's failure vocabulary into its own

without discarding what went wrong.

Read the signature

• The text after the name is the type checked by Pudu.
• Read arrows from left to right: inputs come first, and the final type is returned.
• Names inside [ ] are type arguments, such as the item type held by a collection.
• Result makes success and recoverable failure part of the function's type.