Commit 423a19fa60d2b0a11fc2fb43b12001320c2c53c5 | zig

2 files changed, 43 insertions(+), 2 deletions(-)

src/Sema.zig+10-2

...	...	@@ -22946,8 +22946,13 @@ fn beginComptimePtrLoad(
22946	22946	(try sema.coerceInMemoryAllowed(block, tv.ty, payload_ptr.container_ty, false, target, src, src)) == .ok;
22947	22947	if (coerce_in_mem_ok) {
22948	22948	const payload_val = switch (ptr_val.tag()) {
22949		.eu_payload_ptr => tv.val.castTag(.eu_payload).?.data,
22950		.opt_payload_ptr => if (tv.val.castTag(.opt_payload)) \|some\| some.data else tv.val,
	22949	.eu_payload_ptr => if (tv.val.castTag(.eu_payload)) \|some\| some.data else {
	22950	return sema.fail(block, src, "attempt to unwrap error: {s}", .{tv.val.castTag(.@"error").?.data.name});
	22951	},
	22952	.opt_payload_ptr => if (tv.val.castTag(.opt_payload)) \|some\| some.data else opt: {
	22953	if (tv.val.isNull()) return sema.fail(block, src, "attempt to use null value", .{});
	22954	break :opt tv.val;
	22955	},
22951	22956	else => unreachable,
22952	22957	};
22953	22958	tv.* = TypedValue{ .ty = payload_ty, .val = payload_val };
...	...	@@ -22957,6 +22962,9 @@ fn beginComptimePtrLoad(
22957	22962	deref.pointee = null;
22958	22963	break :blk deref;
22959	22964	},
	22965	.null_value => {
	22966	return sema.fail(block, src, "attempt to use null value", .{});
	22967	},
22960	22968
22961	22969	.zero,
22962	22970	.one,

test/cases/compile_errors/dereferencing_invalid_payload_ptr_at_comptime.zig created+33

...	...	@@ -0,0 +1,33 @@
	1	const std = @import("std");
	2
	3	comptime {
	4	var val: u8 = 15;
	5	var opt_ptr: ?*const u8 = &val;
	6
	7	const payload_ptr = &opt_ptr.?;
	8	opt_ptr = null;
	9	_ = payload_ptr..;
	10	}
	11	comptime {
	12	var opt: ?u8 = 15;
	13
	14	const payload_ptr = &opt.?;
	15	opt = null;
	16	_ = payload_ptr.*;
	17	}
	18	comptime {
	19	var val: u8 = 15;
	20	var err_union: anyerror!u8 = val;
	21
	22	const payload_ptr = &(err_union catch unreachable);
	23	err_union = error.Foo;
	24	_ = payload_ptr.*;
	25	}
	26
	27	// error
	28	// backend=stage2
	29	// target=native
	30	//
	31	// :9:20: error: attempt to use null value
	32	// :16:20: error: attempt to use null value
	33	// :24:20: error: attempt to unwrap error: Foo