Method add_i32

tests/math-wit/src/lib.rs:8–10

(a: i32, b: i32)

impl MathExport for Math {
    fn add_i32(a: i32, b: i32) -> i32 {
        a + b
    }

    fn add_u32(a: u32, b: u32) -> u32 {
        a + b