diff --git a/src/Sema.zig b/src/Sema.zig
index f286b6385f..c55531d924 100644
--- a/src/Sema.zig
+++ b/src/Sema.zig
@@ -3568,9 +3568,10 @@ fn ensureResultUsed(
     const mod = sema.mod;
     switch (ty.zigTypeTag(mod)) {
         .Void, .NoReturn => return,
-        .ErrorSet, .ErrorUnion => {
+        .ErrorSet => return sema.fail(block, src, "error set is ignored", .{}),
+        .ErrorUnion => {
             const msg = msg: {
-                const msg = try sema.errMsg(block, src, "error is ignored", .{});
+                const msg = try sema.errMsg(block, src, "error union is ignored", .{});
                 errdefer msg.destroy(sema.gpa);
                 try sema.errNote(block, src, msg, "consider using 'try', 'catch', or 'if'", .{});
                 break :msg msg;
@@ -3600,9 +3601,10 @@ fn zirEnsureResultNonError(sema: *Sema, block: *Block, inst: Zir.Inst.Index) Com
     const src = inst_data.src();
     const operand_ty = sema.typeOf(operand);
     switch (operand_ty.zigTypeTag(mod)) {
-        .ErrorSet, .ErrorUnion => {
+        .ErrorSet => return sema.fail(block, src, "error set is discarded", .{}),
+        .ErrorUnion => {
             const msg = msg: {
-                const msg = try sema.errMsg(block, src, "error is discarded", .{});
+                const msg = try sema.errMsg(block, src, "error union is discarded", .{});
                 errdefer msg.destroy(sema.gpa);
                 try sema.errNote(block, src, msg, "consider using 'try', 'catch', or 'if'", .{});
                 break :msg msg;
diff --git a/test/cases/compile_errors/discarding_error_value.zig b/test/cases/compile_errors/discarding_error_value.zig
index c24d517d3e..eab3ecaf98 100644
--- a/test/cases/compile_errors/discarding_error_value.zig
+++ b/test/cases/compile_errors/discarding_error_value.zig
@@ -1,13 +1,18 @@
-export fn entry() void {
+export fn entry1() void {
     _ = foo();
 }
 fn foo() !void {
     return error.OutOfMemory;
 }
+export fn entry2() void {
+    const x: error{a} = undefined;
+    _ = x;
+}
 
 // error
 // backend=stage2
 // target=native
 //
-// :2:12: error: error is discarded
+// :2:12: error: error union is discarded
 // :2:12: note: consider using 'try', 'catch', or 'if'
+// :9:9: error: error set is discarded
diff --git a/test/cases/compile_errors/ignored_deferred_function_call.zig b/test/cases/compile_errors/ignored_deferred_function_call.zig
index 9537255d33..90c978b40f 100644
--- a/test/cases/compile_errors/ignored_deferred_function_call.zig
+++ b/test/cases/compile_errors/ignored_deferred_function_call.zig
@@ -5,9 +5,17 @@ fn bar() anyerror!i32 {
     return 0;
 }
 
+export fn foo2() void {
+    defer bar2();
+}
+fn bar2() anyerror {
+    return error.a;
+}
+
 // error
 // backend=stage2
 // target=native
 //
-// :2:14: error: error is ignored
+// :2:14: error: error union is ignored
 // :2:14: note: consider using 'try', 'catch', or 'if'
+// :9:15: error: error set is ignored
diff --git a/test/cases/compile_errors/ignored_expression_in_while_continuation.zig b/test/cases/compile_errors/ignored_expression_in_while_continuation.zig
index 4fa396190a..ca1b60da5e 100644
--- a/test/cases/compile_errors/ignored_expression_in_while_continuation.zig
+++ b/test/cases/compile_errors/ignored_expression_in_while_continuation.zig
@@ -15,13 +15,21 @@ fn bad() anyerror!void {
     return error.Bad;
 }
 
+export fn d() void {
+    while (true) : (bad2()) {}
+}
+fn bad2() anyerror {
+    return error.Bad;
+}
+
 // error
 // backend=stage2
 // target=native
 //
-// :2:24: error: error is ignored
+// :2:24: error: error union is ignored
 // :2:24: note: consider using 'try', 'catch', or 'if'
-// :7:25: error: error is ignored
+// :7:25: error: error union is ignored
 // :7:25: note: consider using 'try', 'catch', or 'if'
-// :12:25: error: error is ignored
+// :12:25: error: error union is ignored
 // :12:25: note: consider using 'try', 'catch', or 'if'
+// :19:25: error: error set is ignored