S0003: unknown ingress effect

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

Explanation

An event binding must be sourced from a known ingress effect such as stdin_line!, stdin_char!, button!, or tick_ms!. Unknown effect names cannot deliver values into the reactive graph.

Common causes

• misspelling an ingress effect name
• using a wrapper or output effect name as an event source
• calling an ingress effect that is not defined by the runtime

Canonical fixes

• use a known ingress effect in event(...)

Before:

line = event(stdin_lines!())

After:

line = event(stdin_line!())

• keep output work in effect bindings instead of event sources

Before:

done = event(print!("ready"))

After:

main! = print!("ready")

Code example

line = event(stdin_lines!())

Links

• RellC diagnostic overview