type Tree =string | map[string]string confuse v

[xcombelle]

Describe the bug

a c error is produced with the following program

type Tree = string| map[string]string
fn append(mut tree Tree) {
        print(tree["key"])
}

fn main() {
}

Reproduction Steps

xcombelle@iMac xco % cat bug.v
type Tree = string| map[string]string 
fn append(mut tree Tree) {
	print(tree["key"])
}

fn main() {
}

xcombelle@iMac xco % v up       
Updating V...
V is already updated.
Current V version: V 0.4.2 97f7c3f, timestamp: 2023-11-08 20:43:48 +0200
xcombelle@iMac xco % v -cg bug.v
/tmp/v_501/bug.4782279060700994107.tmp.c:12663:27: error: array subscript is not an integer
        print(main__Tree_str(tree[_SLIT("key")]));
                                 ^~~~~~~~~~~~~
1 error generated.
builder error: 
==================
C error. This should never happen.

This is a compiler bug, please report it using `v bug file.v`.

https://github.com/vlang/v/issues/new/choose

You can also use #help on Discord: https://discord.gg/vlang

xcombelle@iMac xco % 

Expected Behavior

a v compiler error or no error

Current Behavior

a c error is produced

Possible Solution

No response

Additional Information/Context

No response

V version

Current V version: V 0.4.2 97f7c3f

Environment details (OS name and version, etc.)

xcombelle@iMac xco % v doctor
V full version: V 0.4.2 93d5c2d.97f7c3f
OS: macos, macOS, 14.1, 23B74
Processor: 8 cpus, 64bit, little endian, Apple M1

getwd: /Users/xcombelle/xco
vexe: /Users/xcombelle/v/v
vexe mtime: 2023-11-08 19:35:41

vroot: OK, value: /Users/xcombelle/v
VMODULES: OK, value: /Users/xcombelle/.vmodules
VTMP: OK, value: /tmp/v_501

Git version: git version 2.39.3 (Apple Git-145)
Git vroot status: weekly.2023.44-85-g97f7c3f6
.git/config present: true

CC version: Apple clang version 15.0.0 (clang-1500.0.40.1)
thirdparty/tcc status: thirdparty-macos-arm64 a668e5a0

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