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04c9f50aec
`Sema.explainWhyValueContainsReferenceToComptimeVar` (concise name!) adds notes to an error explaining how to get from a given `Value` to a pointer to some `comptime var` (or a comptime field). Previously, this error could be very opaque in any case where it wasn't obvious where the comptime var pointer came from; particularly for type captures. Now, the error notes explain this to the user.
36 lines
834 B
Zig
36 lines
834 B
Zig
const UnionContainer = union {
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buf: [2]i32,
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};
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fn getUnionSlice() []i32 {
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var c = UnionContainer{ .buf = .{ 1, 2 } };
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return c.buf[0..2];
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}
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const StructContainer = struct {
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buf: [2]i32,
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};
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fn getStructSlice() []i32 {
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var c = StructContainer{ .buf = .{ 3, 4 } };
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return c.buf[0..2];
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}
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comptime {
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@compileLog(getUnionSlice());
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@compileLog(getStructSlice());
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}
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pub fn main() !void {}
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// TODO: the output here has been regressed by #19414.
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// Restoring useful output here will require providing a Sema to TypedValue.print.
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// error
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//
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// :20:5: error: found compile log statement
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//
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// Compile Log Output:
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// @as([]i32, @as([*]i32, @ptrCast(&@as(tmp.UnionContainer, .{ .buf = .{ 1, 2 } }).buf))[0..2])
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// @as([]i32, @as([*]i32, @ptrCast(&@as(tmp.StructContainer, .{ .buf = .{ 3, 4 } }).buf))[0..2])
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