TypeInfo is stored read-only, but mutable from D

[cym13]

Reduced (thanks dustmite) test case:

struct A{}
void main(){
    A a;
    auto y = typeid(a);
    y.name = "Nope, I'm not A";
}

LDC segfaults when compiling the test case without flag.

Version:

LDC - the LLVM D compiler (0.17.0):
  based on DMD v2.068.2 and LLVM 3.7.1
  Default target: x86_64-unknown-linux-gnu
  Host CPU: sandybridge

Arguably one shouldn't be able to even try to change a typeid's name but
dmd2.068.2 -> 2.070.2 (last version at the time) accepts it.

[cym13]

Sorry, just saw the "Reporting LDC issues" section of the wiki:

System: GNU/Linux Archlinux
Architecture: x86_64
LLVM: 3.7.1-1 (from package)
LDC: 0.17.0 (from package)

[redstar]

Hm. LDC does not segfault but the resulting binary.

[cym13]

Sorry, I don't know why I confused the two, you are perfectly right.

[JohanEngelen]

Is this UB or an LDC bug?

[UplinkCoder]

Woohoo a leet issue.

[redstar]

Fixed in all branches.