test/stack_traces.zig: add err union switch case

Author: dweiller

test/stack_traces.zig

@@ -807,4 +807,59 @@ pub fn addCases(cases: *tests.StackTracesContext) void {
             ,
         },
     });
+    cases.addCase(.{
+        .name = "error union switch with call operand",
+        .source =
+        \\pub fn main() !void {
+        \\    try foo();
+        \\    return error.TheSkyIsFalling;
+        \\}
+        \\
+        \\noinline fn failure() error{ Fatal, NonFatal }!void {
+        \\    return error.NonFatal;
+        \\}
+        \\
+        \\fn foo() error{Fatal}!void {
+        \\    return failure() catch |err| switch (err) {
+        \\        error.Fatal => return error.Fatal,
+        \\        error.NonFatal => return,
+        \\    };
+        \\}
+        ,
+        .Debug = .{
+            .expect =
+            \\error: TheSkyIsFalling
+            \\source.zig:3:5: [address] in main (test)
+            \\    return error.TheSkyIsFalling;
+            \\    ^
+            \\
+            ,
+        },
+        .ReleaseSafe = .{
+            .exclude_os = &.{
+                .windows, // TODO
+                .linux, // defeated by aggressive inlining
+            },
+            .expect =
+            \\error: TheSkyIsFalling
+            \\source.zig:3:5: [address] in [function]
+            \\    return error.TheSkyIsFalling;
+            \\    ^
+            \\
+            ,
+            .error_tracing = true,
+        },
+        .ReleaseFast = .{
+            .expect =
+            \\error: TheSkyIsFalling
+            \\
+            ,
+        },
+        .ReleaseSmall = .{
+            .expect =
+            \\error: TheSkyIsFalling
+            \\
+            ,
+        },
+    });
 }