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Sema: better explanation why opaque types require comptime

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This commit is contained in:
Veikka Tuominen 2022-07-11 16:33:37 +03:00
parent 3e2e6c108a
commit 3ceb27c840
2 changed files with 9 additions and 2 deletions
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10
src/Sema.zig
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@ -18098,10 +18098,12 @@ fn explainWhyTypeIsComptime(
.NoReturn,
.Undefined,
.Null,
.Opaque,
.Optional,
=> return,
.Opaque => {
try mod.errNoteNonLazy(src_loc, msg, "opaque type '{}' has undefined size", .{ty.fmt(sema.mod)});
},
.Array, .Vector => {
try sema.explainWhyTypeIsComptime(block, src, msg, src_loc, ty.elemType());
},
@ -18124,6 +18126,10 @@ fn explainWhyTypeIsComptime(
try sema.explainWhyTypeIsComptime(block, src, msg, src_loc, ty.elemType());
},
.Optional => {
var buf: Type.Payload.ElemType = undefined;
try sema.explainWhyTypeIsComptime(block, src, msg, src_loc, ty.optionalChild(&buf));
},
.ErrorUnion => {
try sema.explainWhyTypeIsComptime(block, src, msg, src_loc, ty.errorUnionPayload());
},

1
test/cases/compile_errors/non-const_variables_of_things_that_require_const_variables.zig
View File

@ -40,5 +40,6 @@ const Opaque = opaque {};
// :14:8: note: to modify this variable at runtime, it must be given an explicit fixed-size number type
// :18:8: error: variable of type '@TypeOf(null)' must be const or comptime
// :22:19: error: values of type 'tmp.Opaque' must be comptime known, but operand value is runtime known
// :22:19: note: opaque type 'tmp.Opaque' has undefined size
// :26:8: error: variable of type 'type' must be const or comptime
// :26:8: note: types are not available at runtime