doc/langref.html.in                                                       |  2 +-
 src/AstGen.zig                                                            | 77 +++++++++++++++++++++++---------
 src/Sema.zig                                                              | 27 +++++++++++
 test/behavior/error.zig                                                   | 21 +++++++++
 test/cases/compile_errors/comparison_with_error_union_and_error_value.zig | 10 -----
 test/cases/compile_errors/decl_shadows_local.zig                          |  4 +-
 test/cases/compile_errors/local_shadows_global_that_occurs_later.zig      |  2 +-
 test/cases/compile_errors/local_variable_redeclares_parameter.zig         |  2 +-
 test/cases/compile_errors/local_variable_shadowing_global.zig             |  2 +-
 test/cases/compile_errors/parameter_shadowing_global.zig                  |  2 +-
 test/cases/function_redeclaration.zig                                     |  2 +-
 test/cases/safety/switch else on corrupt enum value - one prong.zig       | 24 ++++++++++
 test/cases/safety/switch else on corrupt enum value - union.zig           | 29 ++++++++++++
 test/cases/safety/switch else on corrupt enum value.zig                   | 23 ++++++++++
 test/cases/variable_shadowing.1.zig                                       |  2 +-
 test/cases/variable_shadowing.3.zig                                       |  2 +-
 test/cases/variable_shadowing.4.zig                                       |  2 +-
 test/cases/variable_shadowing.5.zig                                       |  2 +-
 test/cases/variable_shadowing.6.zig                                       |  2 +-
 test/cases/variable_shadowing.7.zig                                       |  2 +-
 test/cases/variable_shadowing.8.zig                                       |  2 +-
 test/cases/variable_shadowing.9.zig                                       |  2 +-
 22 files changed, 196 insertions(+), 47 deletions(-)