Calling other languages
Nagi can currently call Rust functions. Declare them with @rust and extern def, then include the Rust file and any Cargo dependencies in the build. See Imports and Rust.
Equivalent High and Low types compile to the same Rust types. Calls within one build do not need to convert values through JSON or another serialization format.
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C interfaces
Direct calls to arbitrary C functions from Nagi or Low are not supported. The built-in SQLite implementation connects to C through Rust's rusqlite and libsqlite3-sys libraries.
A fixed C-facing type layout and an ABI for transferring memory allocation and release are not defined. Nagi classes and strings cannot be treated directly as C values.