lib/std/zig/AstGen.zig                                                                        |   1 +
 src/RangeSet.zig                                                                              |  41 ++---
 src/Sema.zig                                                                                  | 303 ++++++++++++++++++--------------
 test/cases/compile_errors/capture_by_ref_discard.zig                                          |   5 +
 test/cases/compile_errors/duplicate_boolean_switch_value.zig                                  |   4 +-
 test/cases/compile_errors/duplicate_error_in_switch.zig                                       |   2 +-
 test/cases/compile_errors/switch_expression-duplicate_enumeration_prong.zig                   |   3 +-
 test/cases/compile_errors/switch_expression-duplicate_enumeration_prong_when_else_present.zig |   3 +-
 test/cases/compile_errors/switch_expression-duplicate_error_prong.zig                         |   4 +-
 test/cases/compile_errors/switch_expression-duplicate_error_prong_when_else_present.zig       |   4 +-
 test/cases/compile_errors/switch_expression-duplicate_or_overlapping_integer_value.zig        |  16 --
 test/cases/compile_errors/switch_expression-duplicate_type.zig                                |   2 +-
 test/cases/compile_errors/switch_expression-duplicate_type_struct_alias.zig                   |   3 +-
 test/cases/compile_errors/switch_on_invalid_type.zig                                          | 103 +++++++++++
 test/cases/compile_errors/switch_on_non_packed_struct.zig                                     |  25 ---
 test/cases/compile_errors/switch_on_union_with_nonexhaustive_tag_is_exhaustive.zig            |  56 ++++++
 test/cases/compile_errors/switch_with_overlapping_case_ranges.zig                             |  42 ++++-
 17 files changed, 402 insertions(+), 215 deletions(-)