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let aString = "a"; bString = "b"; in { hasAttrs = { a.b = null; } ? ${aString}.b; selectAttrs = { a.b = true; }.a.${bString}; selectOrAttrs = { }.${aString} or true; binds = { ${aString}."${bString}c" = true; }.a.bc; recBinds = rec { ${bString} = a; a = true; }.b; multiAttrs = { ${aString} = true; ${bString} = false; }.a; }