hi
hi
hi
hi
1+1
2
{2}
a1
1a
}
λ (α : ?M_1), to_fmt "" ++ to_fmt α ++ to_fmt "" : ?M_1 → format
format_macro.lean:13:6: error: invalid expression, unexpected token
format_macro.lean:14:6: error: invalid expression
format_macro.lean:15:6: error: invalid expression
"a'b'c"