doc/langref.html.in                                                                     |   26 +
 src/AstGen.zig                                                                          |  562 +++++++++++++++++-
 src/Sema.zig                                                                            | 1005 +++++++++++++++++++++++---------
 src/Zir.zig                                                                             |   38 +-
 src/print_zir.zig                                                                       |  140 ++++-
 test/behavior/switch_on_captured_error.zig                                              |  750 ++++++++++++++++++++++++
 test/cases/compile_errors/switch_expression-duplicate_error_prong.zig                   |   33 ++
 test/cases/compile_errors/switch_expression-duplicate_error_prong_when_else_present.zig |   35 ++
 test/cases/compile_errors/switch_expression-missing_error_prong.zig                     |   33 ++
 test/cases/compile_errors/switch_expression-multiple_else_prongs.zig                    |   20 +
 test/cases/compile_errors/switch_expression-unreachable_else_prong_error.zig            |   32 +
 test/cases/compile_errors/switch_on_error_union_discard.zig                             |   12 +
 test/cases/compile_errors/switch_on_error_with_1_field_with_no_prongs.zig               |   20 +
 test/cases/inherit_want_safety.zig                                                      |    7 +
 14 files changed, 2412 insertions(+), 301 deletions(-)