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Justus Klausecker d0586da18e Sema: Improve comptime arithmetic undef handling 
This commit expands on the foundations laid by https://github.com/ziglang/zig/pull/23177
and moves even more `Sema`-only functionality from `Value`
to `Sema.arith`. Specifically all shift and bitwise operations,
`@truncate`, `@bitReverse` and `@byteSwap` have been moved and
adapted to the new rules around `undefined`.

Especially the comptime shift operations have been basically
rewritten, fixing many open issues in the process.

New rules applied to operators:
* `<<`, `@shlExact`, `@shlWithOverflow`, `>>`, `@shrExact`: compile error if any operand is undef
* `<<|`, `~`, `^`, `@truncate`, `@bitReverse`, `@byteSwap`: return undef if any operand is undef
* `&`, `|`: Return undef if both operands are undef, turn undef into actual `0xAA` bytes otherwise

Additionally this commit canonicalizes the representation of
aggregates with all-undefined members in the `InternPool` by
disallowing them and enforcing the usage of a single typed
`undef` value instead. This reduces the amount of edge cases
and fixes a bunch of bugs related to partially undefined vecs.

List of operations directly affected by this patch:
* `<<`, `<<|`, `@shlExact`, `@shlWithOverflow`
* `>>`, `@shrExact`
* `&`, `|`, `~`, `^` and their atomic rmw + reduce pendants
* `@truncate`, `@bitReverse`, `@byteSwap`
2025-08-12 16:33:57 +02:00
..
addWithOverflow_builtin.zig
migrate langref documentation generation to the build system
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anonymous_struct_name.zig
migrate langref documentation generation to the build system
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Assembly Syntax Explained.zig
update docs
2025-07-16 10:27:40 -07:00
assign_undefined.zig
migrate langref documentation generation to the build system
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bad_default_value.zig
update standalone and incremental tests to new API
2025-07-07 22:43:53 -07:00
base64.zig
migrate langref documentation generation to the build system
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build_c.zig
Migrate from deprecated Step.Compile APIs
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build_object.zig
Migrate from deprecated Step.Compile APIs
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build.zig
Migrate from deprecated Step.Compile APIs
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builtin.CallModifier struct.zig
typo: will inlined -> will be inlined
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catch_err_return.zig
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catch.zig
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change_active_union_field.zig
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checking_null_in_zig.zig
Build: cleanup
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cImport_builtin.zig
migrate langref documentation generation to the build system
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cli_allocation.zig
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comments.zig
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compile_variables.zig
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compile-time_duck_typing.zig
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compiler_generated_function.zig
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constant_identifier_cannot_change.zig
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defer_unwind.zig
langref: remove dead code
2025-07-14 17:34:52 +01:00
destructuring_arrays.zig
langref: Document destructuring (#21627)
2025-01-28 04:23:13 +00:00
destructuring_block.zig
langref: Document destructuring (#21627)
2025-01-28 04:23:13 +00:00
destructuring_mixed.zig
langref: Document destructuring (#21627)
2025-01-28 04:23:13 +00:00
destructuring_return_value.zig
langref: Document destructuring (#21627)
2025-01-28 04:23:13 +00:00
destructuring_to_existing.zig
langref: Document destructuring (#21627)
2025-01-28 04:23:13 +00:00
destructuring_vectors.zig
langref: Document destructuring (#21627)
2025-01-28 04:23:13 +00:00
doc_comments.zig
Build: cleanup
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entry_point.zig
langref: document modules, root source files, etc
2025-02-22 21:01:44 +00:00
enum_export_error.zig
langref: update enum_export_error.zig for callconv changes
2024-10-19 19:21:33 +01:00
enum_export.zig
Build: cleanup
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error_return_trace.zig
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error_union_parsing_u64.zig
Build: cleanup
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export_any_symbol_name.zig
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export_builtin_equivalent_code.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
export_builtin.zig
Remove uses of deprecated callconv aliases
2025-03-05 03:01:43 +00:00
fibonacci_comptime_infinite_recursion.zig
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float_literals.zig
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float_mode_exe.zig
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float_mode_obj.zig
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float_special_values.zig
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generic_data_structure.zig
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handle_error_with_catch_block.zig.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
hello_again.zig
update standalone and incremental tests to new API
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hello.zig
update standalone and incremental tests to new API
2025-07-07 22:43:53 -07:00
identifiers.zig
Build: cleanup
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inline_assembly.zig
update docs
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inline_call.zig
langref: don't encourage printing to stderr in tests
2025-07-14 17:32:50 +01:00
inline_prong_range.zig
std: update std.builtin.Type fields to follow naming conventions
2024-08-28 08:39:59 +01:00
integer_literals.zig
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invalid_doc-comment.zig
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libc_export_entry_point.zig
langref: document modules, root source files, etc
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macro.zig
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math_add.zig
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math.zig
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mathtest.zig
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multiline_string_literals.zig
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mutable_var.zig
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not_atomic_cmpxchgStrong.zig
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null.zig
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optional_integer.zig
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packed_struct_mmio.zig
langref: reword some packed struct text and example
2025-04-15 19:19:23 -07:00
panic_handler.zig
langref: document modules, root source files, etc
2025-02-22 21:01:44 +00:00
poc_print_fn.zig
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poc_printValue_fn.zig
std: update std.builtin.Type fields to follow naming conventions
2024-08-28 08:39:59 +01:00
print_comptime-known_format.zig
Build: cleanup
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print.zig
Build: cleanup
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redundant_fqn.zig
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result_location_interfering_with_swap.zig
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result_type_propagation.zig
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runtime_divExact_remainder.zig
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runtime_division_by_zero.zig
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runtime_incorrect_pointer_alignment.zig
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runtime_index_out_of_bounds.zig
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runtime_invalid_cast_truncate.zig
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runtime_invalid_cast.zig
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runtime_invalid_enum_cast.zig
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runtime_invalid_error_code.zig
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runtime_invalid_error_set_cast.zig
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runtime_invalid_null_pointer_cast.zig
migrate langref documentation generation to the build system
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runtime_out_of_bounds_float_to_integer_cast.zig
migrate langref documentation generation to the build system
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runtime_overflow.zig
migrate langref documentation generation to the build system
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runtime_reaching_unreachable.zig
migrate langref documentation generation to the build system
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runtime_remainder_division_by_zero.zig
migrate langref documentation generation to the build system
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runtime_shlExact_overflow.zig
migrate langref documentation generation to the build system
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runtime_shrExact_overflow.zig
langref: runtime_shrExact_overflow does not work as expected on RISC-V
2025-07-01 23:03:15 +02:00
runtime_unwrap_error.zig
migrate langref documentation generation to the build system
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runtime_unwrap_null.zig
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runtime_vs_comptime.zig
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runtime_wrong_union_field_access.zig
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sentinel-terminated_pointer.zig
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single_value_error_set_shortcut.zig
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single_value_error_set.zig
Build: cleanup
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stack_trace.zig
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std_options.zig
langref: document modules, root source files, etc
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string_literals.zig
Build: cleanup
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struct_default_field_values.zig
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struct_default_value.zig
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struct_name.zig
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test_aligned_struct_fields.zig
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test_allocator.zig
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test_allowzero.zig
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test_ambiguous_coercion.zig
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test_anonymous_struct.zig
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test_anonymous_union.zig
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test_arrays.zig
[docs] add examples of array/slice init using result location
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test_assertion_failure.zig
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test_basic_slices.zig
Document a few non-obvious variable assignments (#20213)
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test_bitOffsetOf_offsetOf.zig
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test_blocks.zig
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test_call_builtin.zig
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test_coerce_error_subset_to_superset.zig
Build: cleanup
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test_coerce_error_superset_to_subset.zig
Build: cleanup
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test_coerce_large_to_small.zig
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test_coerce_optional_wrapped_error_union.zig
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test_coerce_optionals.zig
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test_coerce_slices_arrays_and_pointers.zig
[:x]T coerces into [*:x]T
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test_coerce_to_error_union.zig
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test_coerce_tuples_arrays.zig
std: fix typos (#20560)
2024-07-09 14:25:42 -07:00
test_coerce_unions_enums.zig
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test_compileLog_builtin.zig
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test_comptime_call_extern_function.zig
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test_comptime_divExact_remainder.zig
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test_comptime_division_by_zero.zig
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test_comptime_evaluation.zig
Build: cleanup
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test_comptime_incorrect_pointer_alignment.zig
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test_comptime_index_out_of_bounds.zig
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test_comptime_invalid_cast_truncate.zig
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test_comptime_invalid_cast.zig
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test_comptime_invalid_enum_cast.zig
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test_comptime_invalid_error_code.zig
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test_comptime_invalid_error_set_cast.zig
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test_comptime_invalid_null_pointer_cast.zig
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test_comptime_max_with_bool.zig
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test_comptime_mismatched_type.zig
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test_comptime_out_of_bounds_float_to_integer_cast.zig
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test_comptime_overflow.zig
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test_comptime_pointer_conversion.zig
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test_comptime_pointers.zig
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test_comptime_reaching_unreachable.zig
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test_comptime_remainder_division_by_zero.zig
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test_comptime_shlExact_overflow.zig
Sema: Improve comptime arithmetic undef handling
2025-08-12 16:33:57 +02:00
test_comptime_shrExact_overflow.zig
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test_comptime_unreachable.zig
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test_comptime_unwrap_error.zig
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test_comptime_unwrap_null.zig
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test_comptime_variables.zig
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test_comptime_wrong_union_field_access.zig
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test_container_level_variables.zig
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test_container-level_comptime_expressions.zig
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test_defer.zig
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test_defining_variadic_function.zig
Remove uses of deprecated callconv aliases
2025-03-05 03:01:43 +00:00
test_empty_block.zig
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test_enum_literals.zig
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test_enums.zig
std: update std.builtin.Type fields to follow naming conventions
2024-08-28 08:39:59 +01:00
test_errdefer_capture.zig
langref: add example for errdefer |err| sytnax
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test_error_union.zig
std: update std.builtin.Type fields to follow naming conventions
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test_exhaustive_switch.zig
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test_expression_ignored.zig
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test_fibonacci_comptime_overflow.zig
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test_fibonacci_comptime_unreachable.zig
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test_fibonacci_recursion.zig
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test_field_builtin.zig
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test_fn_reflection.zig
std: update std.builtin.Type fields to follow naming conventions
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test_fn_type_inference.zig
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test_for_nested_break.zig
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test_for.zig
Build: cleanup
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test_functions.zig
langref: Update calling convention (#24022)
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test_global_assembly.zig
langref: global assembly test depends on llvm
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test_hasDecl_builtin.zig
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test_if_optionals.zig
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test_if.zig
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test_illegal_behavior.zig
langref: embrace the term "illegal behavior"
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test_incorrect_pointer_alignment.zig
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test_inferred_error_sets.zig
Build: cleanup
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test_inline_else.zig
std: update std.builtin.Type fields to follow naming conventions
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test_inline_for.zig
Build: cleanup
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test_inline_switch_union_tag.zig
Build: cleanup
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test_inline_switch.zig
std: update std.builtin.Type fields to follow naming conventions
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test_inline_while.zig
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test_intCast_builtin.zig
compiler: combine @intCast safety checks
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test_integer_pointer_conversion.zig
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test_integer_widening.zig
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test_invalid_defer.zig
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test_labeled_break.zig
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test_merging_error_sets.zig
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test_misaligned_pointer.zig
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test_missized_packed_struct.zig
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test_multidimensional_arrays.zig
Clarify the multidimensional array example
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test_namespaced_container_level_variable.zig
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test_no_op_casts.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_noreturn_from_exit.zig
Remove numerous things deprecated during the 0.14 release cycle
2025-07-11 08:17:43 +02:00
test_noreturn.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_null_terminated_array.zig
Build: cleanup
2024-05-05 09:42:51 -04:00
test_null_terminated_slice.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_null_terminated_slicing.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_opaque.zig
Remove uses of deprecated callconv aliases
2025-03-05 03:01:43 +00:00
test_optional_pointer.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_optional_type.zig
std: update std.builtin.Type fields to follow naming conventions
2024-08-28 08:39:59 +01:00
test_overaligned_packed_struct.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_packed_struct_equality.zig
implement packed struct equality (#21679)
2024-10-12 20:59:12 -07:00
test_packed_struct_field_address.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_packed_structs.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_pass_by_reference_or_value.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_peer_type_resolution.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_pointer_arithmetic.zig
Sema: support pointer subtraction
2024-07-15 18:18:38 +00:00
test_pointer_casting.zig
std: update std.builtin.Type fields to follow naming conventions
2024-08-28 08:39:59 +01:00
test_pointer_coerce_const_optional.zig
langref: Make pointer_coerce_const_optional test less obfuscated
2024-07-29 16:07:12 -07:00
test_pointer_to_non-byte_aligned_field.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_print_too_many_args.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_reduce_builtin.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_round_builtin.zig
langref: clarify functionality of the round builtin (#19503)
2024-08-14 10:29:45 -07:00
test_scopes.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_sentinel_mismatch.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_setEvalBranchQuota_builtin.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_setRuntimeSafety_builtin.zig
langref: embrace the term "illegal behavior"
2025-02-22 21:01:44 +00:00
test_shadowing.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_shuffle_builtin.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_simple_union.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_single_item_pointer.zig
single pointer slice syntax added
2024-07-21 00:32:50 -07:00
test_slice_bounds.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_slices.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_splat_builtin.zig
langref: update splat section
2025-03-06 07:26:19 +01:00
test_src_builtin.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_static_local_variable.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_string_literal_to_const_slice.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_string_literal_to_slice.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_struct_result.zig
Build: cleanup
2024-05-05 09:42:51 -04:00
test_structs.zig
langref: delete misleading example code about packed structs
2024-11-13 15:35:16 -08:00
test_switch_continue_equivalent.zig
Labeled switch documentation (#21383)
2024-09-12 20:06:49 -07:00
test_switch_continue.zig
Labeled switch documentation (#21383)
2024-09-12 20:06:49 -07:00
test_switch_dispatch_loop.zig
std: remove BoundedArray
2025-08-05 09:56:02 -07:00
test_switch_modify_tagged_union.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_switch_non-exhaustive.zig
Build: cleanup
2024-05-05 09:42:51 -04:00
test_switch_tagged_union.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_switch.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_tagged_union.zig
remove explicit ComplexTypeTag from switch
2024-09-10 20:28:40 -07:00
test_tagName.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_this_builtin.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_thread_local_variables.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_truncate_builtin.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_tuples.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_type_coercion.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_TypeOf_builtin.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_unhandled_enumeration_value.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_union_method.zig
Document a few non-obvious variable assignments (#20213)
2024-06-08 12:39:11 -07:00
test_unreachable.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_unresolved_comptime_value.zig
Build: cleanup
2024-05-05 09:42:51 -04:00
test_variable_alignment.zig
std: update std.builtin.Type fields to follow naming conventions
2024-08-28 08:39:59 +01:00
test_variable_func_alignment.zig
std: update std.builtin.Type fields to follow naming conventions
2024-08-28 08:39:59 +01:00
test_variadic_function.zig
std: update std.builtin.Type fields to follow naming conventions
2024-08-28 08:39:59 +01:00
test_vector.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_void_ignored.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_void_in_hashmap.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_volatile.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_wasmMemoryGrow_builtin.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_while_break.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_while_continue_expression.zig
Build: cleanup
2024-05-05 09:42:51 -04:00
test_while_continue.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_while_else.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_while_error_capture.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_while_nested_break.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_while_null_capture.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_while.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_without_setEvalBranchQuota_builtin.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_wraparound_semantics.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
test_wrong_union_access.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
testing_detect_leak.zig
std.ArrayList: make unmanaged the default
2025-08-11 15:52:49 -07:00
testing_detect_test.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
testing_error_with_if.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
testing_failure.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
testing_introduction.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
testing_namespace.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
testing_null_with_if.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
testing_skip.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
tldoc_comments.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
TopLevelFields.zig
langref: document modules, root source files, etc
2025-02-22 21:01:44 +00:00
try.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
unattached_doc-comment.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
undefined_active_union_field.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
values.zig
Build: cleanup
2024-05-05 09:42:51 -04:00
var_must_be_initialized.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
verbose_cimport_flag.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00
wasi_args.zig
Replace deprecated default initializations with decl literals
2024-09-12 16:01:23 +01:00
wasi_preopens.zig
Replace deprecated default initializations with decl literals
2024-09-12 16:01:23 +01:00
zero_bit_types.zig
migrate langref documentation generation to the build system
2024-04-25 00:09:24 -07:00