segmentation fault pointer dereference runtime

[iamnobodytoo]

pub fn main() void {
    var b1: *u8 = &@as(u8, 101);
    b1.* += 1;
}

if I do it like this (by using an additional var) it works fine

pub fn main() void {
    var ba: u8 = 101;
    var b1: *u8 = &ba; // or &u8(ba)
    b1.* +=1;
}

zig version: 0.4.0
system: antergos linux 5.0.7-arch1-1-ARCH

[andrewrk]

This should be a compile error, &u8(101) should be a const pointer.

[Vexu]

Duplicate of #2130, fixed by #4971.

Semantic Analysis [530/822] ./build/a.zig:270:20: error: expected type '*u8', found '*const u8'
    var b1: *u8 = &@as(u8, 101);
                   ^
./build/a.zig:270:20: note: cast discards const qualifier
    var b1: *u8 = &@as(u8, 101);
                   ^