Casting alias to array fail

[elliotchance]

V doctor:

OS: macos, macOS, 11.2.3, 20D91
Processor: 8 cpus, 64bit, little endian, Intel(R) Core(TM) i7-4850HQ CPU @ 2.30GHz
CC version: Apple clang version 12.0.5 (clang-1205.0.22.11)

getwd: /Users/elliot/v/src/github.com/elliotchance/v-bigint
vmodules: /Users/elliot/.vmodules
vroot: /Users/elliot/v
vexe: /Users/elliot/v/v
vexe mtime: 2021-07-05 22:56:24
is vroot writable: true
is vmodules writable: true
V full version: V 0.2.2 9e61321

Git version: git version 2.30.1 (Apple Git-130)
Git vroot status: Error: fatal: not a git repository (or any of the parent directories): .git
.git/config present: false
thirdparty/tcc status: thirdparty-macos-amd64 689c8a02-dirty

What did you do?
v -g -o vdbg cmd/v && vdbg bug/cast_slice.v

type Ints = []int

values := Ints([5, 7, 9])
valuesAsIntArray := []int(values)

println(valuesAsIntArray)

What did you expect to see?

[5, 7, 9]

What did you see instead?

bug/cast_slice.v:4:21: warning: use `x := []Type{}` instead of `x := []Type`
    2 | 
    3 | values := Ints([5, 7, 9])
    4 | valuesAsIntArray := []int(values)
      |                     ~~~~~~
    5 | 
    6 | println(valuesAsIntArray)
bug/cast_slice.v:4:26: error: expression evaluated but not used
    2 | 
    3 | values := Ints([5, 7, 9])
    4 | valuesAsIntArray := []int(values)
      |                          ~~~~~~~~
    5 | 
    6 | println(valuesAsIntArray)