Pointer operations must be wrapped in unsafe

[ArtemkaKun]

Describe the bug

The code below shows how to mutate variable that wasn't marked as mut. Since V is considered to be a secure language, pointer operations like below must be wrapped in unsafe block so it will be clear for end programmer what is going on

Reproduction Steps

c := 0
cref := &c
(*cref)++

println(c)

Expected Behavior

Outputs warning, outputs 1

Current Behavior

No warning, outputs 1

Possible Solution

No response

Additional Information/Context

No response

V version

0.4.2

Environment details (OS name and version, etc.)

Unrelated

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