doc/langref.html.in            |  17 ++++
 src/all_types.hpp              |  11 +++
 src/codegen.cpp                |   2 +
 src/ir.cpp                     | 154 ++++++++++++++++++++++++++------
 src/ir_print.cpp               |  15 ++++
 test/stage1/behavior/union.zig |  37 +++++++-
 6 files changed, 208 insertions(+), 28 deletions(-)