lib/std/zig/AstGen.zig | 421 ++++++++++++++++----------------
 lib/std/zig/Zir.zig    |  16 +-
 src/Sema.zig           |  46 ++--
 test/behavior/fn.zig   |  51 ++++
 4 files changed, 292 insertions(+), 242 deletions(-)