User:Rrvdw
Appearance
{{!}} should produce the pipe-symbol "|": |
{{!|-{}} should also produce the pipe-symbol: {{!|-{}} (but it does not)
{{!|Foo=-{}} should also produce the pipe-symbol: {{!|Foo=-{}} (but it does not)
{{!|Foo={}} shows that the curly bracket is not the issue: