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ast: Add comptime reason for error set merge #25398

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ast: Add comptime reason for error set merge 
Signed-off-by: Marek Maškarinec <marek@mrms.cz>
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@marekmaskarinec
marekmaskarinec committed Sep 28, 2025
commit d67e95db342f0638a728aaa39afffa24d2f6bbb9
2 changes: 2 additions & 0 deletions lib/std/zig.zig
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Original file line number Diff line number Diff line change
Expand Up @@ -765,6 +765,7 @@ pub const SimpleComptimeReason = enum(u32) {
// Reasons other than `.type` are just more specific messages.
type,
array_sentinel,
merge_error_set,
pointer_sentinel,
slice_sentinel,
array_length,
Expand Down Expand Up @@ -843,6 +844,7 @@ pub const SimpleComptimeReason = enum(u32) {
.clobber => "clobber must be comptime-known",

.type => "types must be comptime-known",
.merge_error_set => "operand to error set merge (||) must be an error set",

@silversquirl silversquirl Sep 30, 2025

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Suggested change
.merge_error_set => "operand to error set merge (||) must be an error set",
.merge_error_set => "operand to error set merge operator (||) must be a type",

although, really, it would probably be better to use the types must be comptime-known error message, with an additional note explaining why it expects a type.

.array_sentinel => "array sentinel value must be comptime-known",
.pointer_sentinel => "pointer sentinel value must be comptime-known",
.slice_sentinel => "slice sentinel value must be comptime-known",
Expand Down
4 changes: 2 additions & 2 deletions lib/std/zig/AstGen.zig
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Expand Up @@ -793,8 +793,8 @@ fn expr(gz: *GenZir, scope: *Scope, ri: ResultInfo, node: Ast.Node.Index) InnerE
else => unreachable,
};
const lhs_node, const rhs_node = tree.nodeData(node).node_and_node;
const lhs = try reachableTypeExpr(gz, scope, lhs_node, node);
const rhs = try reachableTypeExpr(gz, scope, rhs_node, node);
const lhs = try reachableExprComptime(gz, scope, coerced_type_ri, lhs_node, node, .merge_error_set);
const rhs = try reachableExprComptime(gz, scope, coerced_type_ri, rhs_node, node, .merge_error_set);
const result = try gz.addPlNode(inst_tag, node, Zir.Inst.Bin{ .lhs = lhs, .rhs = rhs });
return rvalue(gz, ri, result, node);
},
Expand Down