LLVM assert instantiating mutually recursive struct

[brson]

struct TestNode {
    data: @TestData
}

struct TestData {
    parent: Option<TestNode>
}

fn main() {
    let node = TestNode {
        data: @TestData {
            parent: None
        }
    };
}

rustc: /home/brian/dev/rust/src/llvm/lib/Target/TargetData.cpp:468: uint64_t llvm::TargetData::getTypeSizeInBits(llvm::Type*) const: Assertion `Ty->isSized() && "Cannot getTypeInfo() on a type that is unsized!"' failed.

[brson]

Removing the boxes yields a different error - an out of stack ICE

struct TestNode {
    data: @TestData
}

struct TestData {
    parent: Option<TestNode>
}

fn main() {
    let node = TestNode {
        data: @TestData {
            parent: None
        }
    };
}

[catamorphism]

The error with the removed boxes is #3779 .

[catamorphism]

And the original bug is a dup of #3778 .