S0049: unknown pattern type or enum variant

Generated from rellum-diagnostics/src/db.rs.

Explanation

Record and enum patterns must name known types, and enum variant patterns must name a variant declared by the enum. Unknown names cannot be mapped to a payload layout.

Common causes

• misspelling a record or enum type in a pattern
• forgetting to import the type used by a pattern
• matching an enum variant name that is not declared on that enum

Canonical fixes

• use the declared type and variant names

Before:

match conn
    Connection::Online { handle } => handle

After:

match conn
    Connection::Connected { handle } => handle

• declare or import the type before matching

Code example

match conn
    Connection::Online { handle } => handle

Links

• RellC diagnostic overview