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c.universe.Expr[Any]* <: c.universe.Expr[String]*?
false
BadMac_2.scala:6: error: macro implementation has incompatible shape:
required: (c: scala.reflect.macros.blackbox.Context)(format: c.Expr[String], params: c.Expr[Any]*): c.Expr[Unit]
or : (c: scala.reflect.macros.blackbox.Context)(format: c.Tree, params: Tree*): c.Tree
found : (c: scala.reflect.macros.blackbox.Context)(format: c.Expr[String], params: c.Expr[String]*): c.Expr[Unit]
type mismatch for parameter params: c.Expr[Any]* does not conform to c.Expr[String]*
def printf(format: String, params: Any*): Unit = macro printf_impl
^
one error found
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