TinyGo Panics on Generic Type Aliases

[Yeaseen]

TinyGo crashes when compiling a generic type alias, even when using GODEBUG=gotypesalias=1. Though I am not sure whether TinyGo supports generic type aliases correctly.

$ cat test.go
package main
import "fmt"
// Define a generic type
type Wrapper[T any] struct {
	Value T
}
// Alias declaration with type parameter
type Alias[T any] = Wrapper[T]

func main() {
	// Using the alias
	var a Alias[int] = Alias[int]{Value: 42}
	fmt.Println("a:", a.Value)
}

GODEBUG=gotypesalias=1 tinygo run test.go
panic: unknown type: main.Alias[int]

goroutine 200 [running]:
github.com/tinygo-org/tinygo/compiler.(*compilerContext).makeLLVMType(0xc003bb2000?, {0x7020428?, 0xc00287d340?})
        /__w/tinygo/tinygo/compiler/compiler.go:468 +0x539

[gandarez]

It produces different errors when setting target.

Without target set

GODEBUG=gotypesalias=1 tinygo run main.go

panic: unknown type: sync.Mutex

goroutine 54 [running]:
github.com/tinygo-org/tinygo/compiler.(*compilerContext).makeLLVMType(0x14001ca8000?, {0x10aa97468?, 0x1400587a800?})
        /Users/runner/work/tinygo/tinygo/compiler/compiler.go:468 +0x578

With pico2-w target set

GODEBUG=gotypesalias=1 tinygo run -target=pico2-w main.go

panic: unknown type: any

goroutine 116 [running]:
github.com/tinygo-org/tinygo/compiler.(*compilerContext).makeLLVMType(0x1400af8a280?, {0x10b4ab468?, 0x140000221c0?})
        /Users/runner/work/tinygo/tinygo/compiler/compiler.go:468 +0x578

Even though changing it from any to int return the same result panic: unknown type: any.

[eliasnaur]

Probable dupe: #4416

[ofauchon]

Hello.

Same behaviour with ArchLinux (and llvm19 packages)

$ pacman -Q llvm 
llvm 19.1.7-1

$ cd tinygo
$ git switch dev
$ git pull --recurse-submodules
$ rm -fr llvm-project
$ make llvm-source
$ go install 

$ tinygo version
tinygo version 0.38.0-dev-91e20a53 linux/amd64 (using go version go1.24.1 and LLVM version 19.1.7)

$ cat main.go 
package main
func main() {
        println("Hello")
}

$ tinygo clean
$ tinygo build -target=pico 
panic: unknown type: internal/task.Uint32

goroutine 87 [running]:
github.com/tinygo-org/tinygo/compiler.(*compilerContext).makeLLVMType(0xc007890640?, {0xa9f528?, 0xc003123800?})
	/home/olivier/dev/contrib/tinygo/compiler/compiler.go:468 +0x539
github.com/tinygo-org/tinygo/compiler.(*compilerContext).getLLVMType(0xc007890640, {0xa9f528, 0xc003123800})
	/home/olivier/dev/contrib/tinygo/compiler/compiler.go:383 +0x65
github.com/tinygo-org/tinygo/compiler.(*compilerContext).createDIType(0xc007890640, {0xa9f528, 0xc003123800})
	/home/olivier/dev/contrib/tinygo/compiler/compiler.go:496 +0x3a

$ GODEBUG=gotypesalias=0 tinygo build
=> Compilation OK