Odin/tests/issues/test_issue_6874.odin

// Test for issue #6874 https://github.com/odin-lang/Odin/issues/6874

package test_issues

import "core:fmt"

PersonData :: struct {
	health: int,
	age: int,
}

MyUnion :: union {
	f32,
	int,
	PersonData,
}

change_union_data :: proc(data: MyUnion) {
	switch &v in data {
	case int:
		v = 10
	case f32:
		fmt.println("f32")
	case PersonData:
		fmt.println("PersonData")
		fmt.println(v)
	}
}

main :: proc() {
	val: MyUnion = int(12)
	fmt.printfln("Before the call: %v", val)
	change_union_data(val)
	fmt.printfln("After the call: %v", val)
}