1d9b1c0212
Mainly affects ZIR representation of switch_block[_ref] and special prong (detection) logic for switch. Adds a new SpecialProng tag 'absorbing_under' that allows specifying additional explicit tags in a '_' prong which are respected when checking that every value is handled during semantic analysis but are not transformed into AIR and instead 'absorbed' by the '_' branch.
44 lines
1.0 KiB
Zig
44 lines
1.0 KiB
Zig
const E = enum(u8) {
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a,
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b,
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_,
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};
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const U = union(E) {
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a: i32,
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b: u32,
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};
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pub export fn entry1() void {
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const e: E = .b;
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switch (e) { // error: switch not handling the tag `b`
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.a => {},
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_ => {},
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}
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}
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pub export fn entry2() void {
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const e: E = .b;
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switch (e) { // error: switch on non-exhaustive enum must include `else` or `_` prong
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.a => {},
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.b => {},
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}
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}
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pub export fn entry3() void {
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const u = U{ .a = 2 };
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switch (u) { // error: `_` prong not allowed when switching on tagged union
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.a => {},
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.b => {},
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_ => {},
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}
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}
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// error
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// backend=stage2
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// target=native
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//
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// :12:5: error: switch must handle all possibilities
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// :3:5: note: unhandled enumeration value: 'b'
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// :1:11: note: enum 'tmp.E' declared here
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// :19:5: error: switch on non-exhaustive enum must include 'else' or '_' prong
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// :26:5: error: '_' prong only allowed when switching on non-exhaustive enums
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// :29:9: note: '_' prong here
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// :26:5: note: consider using 'else'
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