mirror of
https://github.com/ziglang/zig.git
synced 2024-11-27 07:32:44 +00:00
88f5315ddf
This change implements the following syntax into the compiler:
```zig
const x: u32, var y, foo.bar = .{ 1, 2, 3 };
```
A destructure expression may only appear within a block (i.e. not at
comtainer scope). The LHS consists of a sequence of comma-separated var
decls and/or lvalue expressions. The RHS is a normal expression.
A new result location type, `destructure`, is used, which contains
result pointers for each component of the destructure. This means that
when the RHS is a more complicated expression, peer type resolution is
not used: each result value is individually destructured and written to
the result pointers. RLS is always used for destructure expressions,
meaning every `const` on the LHS of such an expression creates a true
stack allocation.
Aside from anonymous array literals, Sema is capable of destructuring
the following types:
* Tuples
* Arrays
* Vectors
A destructure may be prefixed with the `comptime` keyword, in which case
the entire destructure is evaluated at comptime: this means all `var`s
in the LHS are `comptime var`s, every lvalue expression is evaluated at
comptime, and the RHS is evaluated at comptime. If every LHS is a
`const`, this is not allowed: as with single declarations, the user
should instead mark the RHS as `comptime`.
There are a few subtleties in the grammar changes here. For one thing,
if every LHS is an lvalue expression (rather than a var decl), a
destructure is considered an expression. This makes, for instance,
`if (cond) x, y = .{ 1, 2 };` valid Zig code. A destructure is allowed
in almost every context where a standard assignment expression is
permitted. The exception is `switch` prongs, which cannot be
destructures as the comma is ambiguous with the end of the prong.
A follow-up commit will begin utilizing this syntax in the Zig compiler.
Resolves: #498
261 lines
11 KiB
Zig
261 lines
11 KiB
Zig
const builtin = @import("builtin");
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test {
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_ = @import("behavior/align.zig");
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_ = @import("behavior/alignof.zig");
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_ = @import("behavior/array.zig");
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_ = @import("behavior/async_fn.zig");
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_ = @import("behavior/atomics.zig");
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_ = @import("behavior/await_struct.zig");
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_ = @import("behavior/basic.zig");
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_ = @import("behavior/bit_shifting.zig");
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_ = @import("behavior/bitcast.zig");
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_ = @import("behavior/bitreverse.zig");
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_ = @import("behavior/bool.zig");
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// Ideally, all tests would be categorized and independent from GitHub, but
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// if that's too much trouble, having test coverage this way is better than nothing.
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_ = @import("behavior/bugs/394.zig");
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_ = @import("behavior/bugs/421.zig");
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_ = @import("behavior/bugs/529.zig");
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_ = @import("behavior/bugs/624.zig");
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_ = @import("behavior/bugs/655.zig");
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_ = @import("behavior/bugs/656.zig");
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_ = @import("behavior/bugs/679.zig");
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_ = @import("behavior/bugs/704.zig");
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_ = @import("behavior/bugs/718.zig");
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_ = @import("behavior/bugs/726.zig");
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_ = @import("behavior/bugs/828.zig");
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_ = @import("behavior/bugs/920.zig");
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_ = @import("behavior/bugs/1025.zig");
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_ = @import("behavior/bugs/1076.zig");
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_ = @import("behavior/bugs/1277.zig");
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_ = @import("behavior/bugs/1310.zig");
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_ = @import("behavior/bugs/1381.zig");
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_ = @import("behavior/bugs/1421.zig");
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_ = @import("behavior/bugs/1442.zig");
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_ = @import("behavior/bugs/1486.zig");
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_ = @import("behavior/bugs/1500.zig");
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_ = @import("behavior/bugs/1607.zig");
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_ = @import("behavior/bugs/1735.zig");
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_ = @import("behavior/bugs/1741.zig");
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_ = @import("behavior/bugs/1851.zig");
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_ = @import("behavior/bugs/1914.zig");
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_ = @import("behavior/bugs/2006.zig");
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_ = @import("behavior/bugs/2114.zig");
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_ = @import("behavior/bugs/2346.zig");
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_ = @import("behavior/bugs/2557.zig");
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_ = @import("behavior/bugs/2578.zig");
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_ = @import("behavior/bugs/2622.zig");
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_ = @import("behavior/bugs/2692.zig");
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_ = @import("behavior/bugs/2727.zig");
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_ = @import("behavior/bugs/2889.zig");
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_ = @import("behavior/bugs/3007.zig");
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_ = @import("behavior/bugs/3046.zig");
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_ = @import("behavior/bugs/3112.zig");
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_ = @import("behavior/bugs/3367.zig");
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_ = @import("behavior/bugs/3384.zig");
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_ = @import("behavior/bugs/3586.zig");
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_ = @import("behavior/bugs/3742.zig");
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_ = @import("behavior/bugs/3779.zig");
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_ = @import("behavior/bugs/4328.zig");
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_ = @import("behavior/bugs/4560.zig");
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_ = @import("behavior/bugs/4769_a.zig");
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_ = @import("behavior/bugs/4769_b.zig");
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_ = @import("behavior/bugs/4954.zig");
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_ = @import("behavior/bugs/5398.zig");
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_ = @import("behavior/bugs/5413.zig");
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_ = @import("behavior/bugs/5474.zig");
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_ = @import("behavior/bugs/5487.zig");
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_ = @import("behavior/bugs/6047.zig");
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_ = @import("behavior/bugs/6456.zig");
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_ = @import("behavior/bugs/6781.zig");
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_ = @import("behavior/bugs/6850.zig");
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_ = @import("behavior/bugs/6905.zig");
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_ = @import("behavior/bugs/6947.zig");
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_ = @import("behavior/bugs/7003.zig");
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_ = @import("behavior/bugs/7047.zig");
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_ = @import("behavior/bugs/7187.zig");
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_ = @import("behavior/bugs/7325.zig");
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_ = @import("behavior/bugs/8277.zig");
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_ = @import("behavior/bugs/8646.zig");
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_ = @import("behavior/bugs/9584.zig");
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_ = @import("behavior/bugs/10138.zig");
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_ = @import("behavior/bugs/10147.zig");
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_ = @import("behavior/bugs/10970.zig");
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_ = @import("behavior/bugs/10684.zig");
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_ = @import("behavior/bugs/11046.zig");
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_ = @import("behavior/bugs/11100.zig");
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_ = @import("behavior/bugs/11139.zig");
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_ = @import("behavior/bugs/11159.zig");
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_ = @import("behavior/bugs/11162.zig");
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_ = @import("behavior/bugs/11165.zig");
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_ = @import("behavior/bugs/11179.zig");
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_ = @import("behavior/bugs/11181.zig");
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_ = @import("behavior/bugs/11213.zig");
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_ = @import("behavior/bugs/11787.zig");
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_ = @import("behavior/bugs/11816.zig");
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_ = @import("behavior/bugs/11995.zig");
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_ = @import("behavior/bugs/12000.zig");
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_ = @import("behavior/bugs/12003.zig");
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_ = @import("behavior/bugs/12025.zig");
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_ = @import("behavior/bugs/12033.zig");
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_ = @import("behavior/bugs/12043.zig");
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_ = @import("behavior/bugs/12051.zig");
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_ = @import("behavior/bugs/12092.zig");
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_ = @import("behavior/bugs/12119.zig");
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_ = @import("behavior/bugs/12142.zig");
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_ = @import("behavior/bugs/12169.zig");
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_ = @import("behavior/bugs/12430.zig");
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_ = @import("behavior/bugs/12450.zig");
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_ = @import("behavior/bugs/12486.zig");
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_ = @import("behavior/bugs/12498.zig");
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_ = @import("behavior/bugs/12551.zig");
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_ = @import("behavior/bugs/12571.zig");
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_ = @import("behavior/bugs/12644.zig");
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_ = @import("behavior/bugs/12680.zig");
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_ = @import("behavior/bugs/12723.zig");
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_ = @import("behavior/bugs/12776.zig");
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_ = @import("behavior/bugs/12786.zig");
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_ = @import("behavior/bugs/12794.zig");
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_ = @import("behavior/bugs/12801-1.zig");
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_ = @import("behavior/bugs/12801-2.zig");
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_ = @import("behavior/bugs/12885.zig");
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_ = @import("behavior/bugs/12890.zig");
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_ = @import("behavior/bugs/12891.zig");
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_ = @import("behavior/bugs/12911.zig");
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_ = @import("behavior/bugs/12928.zig");
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_ = @import("behavior/bugs/12945.zig");
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_ = @import("behavior/bugs/12972.zig");
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_ = @import("behavior/bugs/12984.zig");
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_ = @import("behavior/bugs/13064.zig");
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_ = @import("behavior/bugs/13065.zig");
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_ = @import("behavior/bugs/13068.zig");
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_ = @import("behavior/bugs/13069.zig");
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_ = @import("behavior/bugs/13112.zig");
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_ = @import("behavior/bugs/13113.zig");
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_ = @import("behavior/bugs/13128.zig");
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_ = @import("behavior/bugs/13159.zig");
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_ = @import("behavior/bugs/13171.zig");
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_ = @import("behavior/bugs/13209.zig");
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_ = @import("behavior/bugs/13285.zig");
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_ = @import("behavior/bugs/13366.zig");
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_ = @import("behavior/bugs/13435.zig");
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_ = @import("behavior/bugs/13664.zig");
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_ = @import("behavior/bugs/13714.zig");
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_ = @import("behavior/bugs/13785.zig");
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_ = @import("behavior/bugs/14854.zig");
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_ = @import("behavior/bugs/15778.zig");
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_ = @import("behavior/byteswap.zig");
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_ = @import("behavior/byval_arg_var.zig");
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_ = @import("behavior/c_char_signedness.zig");
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_ = @import("behavior/call.zig");
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_ = @import("behavior/call_tail.zig");
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_ = @import("behavior/cast.zig");
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_ = @import("behavior/cast_int.zig");
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_ = @import("behavior/comptime_memory.zig");
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_ = @import("behavior/const_slice_child.zig");
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_ = @import("behavior/decltest.zig");
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_ = @import("behavior/duplicated_test_names.zig");
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_ = @import("behavior/defer.zig");
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_ = @import("behavior/destructure.zig");
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_ = @import("behavior/empty_tuple_fields.zig");
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_ = @import("behavior/empty_union.zig");
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_ = @import("behavior/enum.zig");
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_ = @import("behavior/error.zig");
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_ = @import("behavior/eval.zig");
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_ = @import("behavior/export_self_referential_type_info.zig");
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_ = @import("behavior/field_parent_ptr.zig");
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_ = @import("behavior/floatop.zig");
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_ = @import("behavior/fn.zig");
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_ = @import("behavior/fn_delegation.zig");
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_ = @import("behavior/fn_in_struct_in_comptime.zig");
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_ = @import("behavior/for.zig");
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_ = @import("behavior/generics.zig");
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_ = @import("behavior/hasdecl.zig");
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_ = @import("behavior/hasfield.zig");
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_ = @import("behavior/if.zig");
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_ = @import("behavior/import.zig");
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_ = @import("behavior/incomplete_struct_param_tld.zig");
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_ = @import("behavior/inline_switch.zig");
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_ = @import("behavior/int128.zig");
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_ = @import("behavior/int_comparison_elision.zig");
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_ = @import("behavior/ptrfromint.zig");
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_ = @import("behavior/ir_block_deps.zig");
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_ = @import("behavior/lower_strlit_to_vector.zig");
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_ = @import("behavior/math.zig");
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_ = @import("behavior/maximum_minimum.zig");
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_ = @import("behavior/member_func.zig");
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_ = @import("behavior/memcpy.zig");
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_ = @import("behavior/memset.zig");
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_ = @import("behavior/merge_error_sets.zig");
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_ = @import("behavior/muladd.zig");
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_ = @import("behavior/namespace_depends_on_compile_var.zig");
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_ = @import("behavior/null.zig");
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_ = @import("behavior/optional.zig");
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_ = @import("behavior/packed-struct.zig");
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_ = @import("behavior/packed_struct_explicit_backing_int.zig");
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_ = @import("behavior/packed-union.zig");
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_ = @import("behavior/pointers.zig");
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_ = @import("behavior/popcount.zig");
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_ = @import("behavior/prefetch.zig");
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_ = @import("behavior/ptrcast.zig");
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_ = @import("behavior/pub_enum.zig");
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_ = @import("behavior/ref_var_in_if_after_if_2nd_switch_prong.zig");
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_ = @import("behavior/reflection.zig");
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_ = @import("behavior/return_address.zig");
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_ = @import("behavior/saturating_arithmetic.zig");
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_ = @import("behavior/select.zig");
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_ = @import("behavior/shuffle.zig");
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_ = @import("behavior/sizeof_and_typeof.zig");
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_ = @import("behavior/slice.zig");
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_ = @import("behavior/slice_sentinel_comptime.zig");
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_ = @import("behavior/src.zig");
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_ = @import("behavior/struct.zig");
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_ = @import("behavior/struct_contains_null_ptr_itself.zig");
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_ = @import("behavior/struct_contains_slice_of_itself.zig");
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_ = @import("behavior/switch.zig");
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_ = @import("behavior/switch_prong_err_enum.zig");
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_ = @import("behavior/switch_prong_implicit_cast.zig");
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_ = @import("behavior/this.zig");
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_ = @import("behavior/threadlocal.zig");
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_ = @import("behavior/translate_c_macros.zig");
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_ = @import("behavior/truncate.zig");
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_ = @import("behavior/try.zig");
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_ = @import("behavior/tuple.zig");
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_ = @import("behavior/tuple_declarations.zig");
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_ = @import("behavior/type.zig");
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_ = @import("behavior/type_info.zig");
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_ = @import("behavior/type_info_only_pub_decls.zig");
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_ = @import("behavior/typename.zig");
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_ = @import("behavior/undefined.zig");
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_ = @import("behavior/underscore.zig");
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_ = @import("behavior/union.zig");
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_ = @import("behavior/union_with_members.zig");
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_ = @import("behavior/usingnamespace.zig");
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_ = @import("behavior/var_args.zig");
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_ = @import("behavior/vector.zig");
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_ = @import("behavior/void.zig");
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_ = @import("behavior/while.zig");
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_ = @import("behavior/widening.zig");
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if (builtin.cpu.arch == .wasm32) {
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_ = @import("behavior/wasm.zig");
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}
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if (builtin.os.tag != .wasi) {
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_ = @import("behavior/asm.zig");
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}
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if (builtin.zig_backend != .stage2_arm and
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builtin.zig_backend != .stage2_x86_64 and
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builtin.zig_backend != .stage2_aarch64 and
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builtin.zig_backend != .stage2_c and
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builtin.zig_backend != .stage2_spirv64)
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{
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_ = @import("behavior/bugs/13063.zig");
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_ = @import("behavior/bugs/11227.zig");
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_ = @import("behavior/bugs/14198.zig");
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_ = @import("behavior/export.zig");
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}
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}
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