[CPP Panic] Invalid Type Conversion

[dozn]

Context

package main
import "core:fmt"
main :: proc() {
	return_union()
}

Union :: union { Distinct_String }
Distinct_String :: distinct string
return_union :: proc() -> Union {
	return Distinct_String(fmt.ctprint(""))
}

Expected Behavior

No error

Current Behavior

Odin\src\llvm_backend_expr.cpp(2494): Panic: Invalid type conversion: 'string' to 'Union' for procedure 'main::return_union'

Notes

• Distinct_String must be distinct
• • distinct cstring instead of distinct string works
• No error when using cstring() or fmt.tprint/f/ln() instead of fmt.ctprint/f/ln()
• Possibly related conversion issues in the same area of CPP code: Maybe(string) != string causes compiler crash #2672, Union type conversion panic when multiplying quaternions #2680, Hitting a LLVM backend panic #4819

---

Odin: dev-2025-02:ebda946d6
OS: Windows 11 Professional (version: 23H2), build 22631.4890
CPU: AMD Ryzen 7 7700 8-Core Processor
RAM: 64617 MiB
Backend: LLVM 18.1.8