Can't use labeled block as if body?

[donaldcallen]

This code:

comptime std.debug.assert(builtin.single_threaded);
            const cache = struct {
                var maybe_statement: ?*s.sqlite3_stmt = null;
            };
            if (cache.maybe_statement) |stmt| stmt
            else :miss {
                cache.maybe_statement = zlib.prepare_statement([*:0]const u8, globals.db,
                    queries.account_child_all_sql);;
                break :miss cache.maybe_statement orelse unreachable;
            }

Results in this error:

zig build-exe --main-pkg-path .. --single-threaded `pkg-config --libs gtk+-3.0` -L/usr/local/lib -L/usr/lib -lc -lsqlite3 newcash.zig
./book.zig:78:18: error: invalid token: ':'
            else :miss {
                 ^

I am trying to use the if as expression, returning a value from either leg of the if. The else side
involves more than one statement, so I believe I need to use a labeled block to return a value from it. The compiler isn't buying it. Comments? Suggestions?

[donaldcallen]

Forgot to mention -- I am using zig-linux-x86_64-0.6.0+986aa42d3.tar.xz on an up-to-date
Slackware current system.

[SpexGuy]

The : goes on the right side of the label when specifying it and the left when referencing it. So it should be

else miss: {
    ...
    break :miss <return value>;
}

We should probably call that out specifically in the docs, it's kind of hard to see.

[Tetralux]

... Or we could remove the need for the : when referencing it 😁

else miss: {
    break miss ret_val;
};

[donaldcallen]

Thank you very much.

I will comment that this is a bit of syntax that merits reconsideration.

[squeek502]

Relevant proposal: #5083