src/Module.zig                 |  65 +++++-
 src/Sema.zig                   | 373 ++++++++++++++++++++++----------
 src/codegen/llvm.zig           | 239 +++++++++++++++-----
 src/codegen/llvm/bindings.zig  |   3 +
 src/type.zig                   |  51 ++++-
 test/behavior/union.zig        |  39 ++++
 test/behavior/union_stage1.zig |  49 +----
 7 files changed, 583 insertions(+), 236 deletions(-)