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Fix quote report code example #11036

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Merged
merged 1 commit into from
Jan 8, 2021
Merged

Fix quote report code example #11036

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4 changes: 2 additions & 2 deletions docs/docs/reference/metaprogramming/macros.md
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Original file line number Diff line number Diff line change
Expand Up @@ -742,12 +742,12 @@ extension (inline sc: StringContext)
inline def showMe(inline args: Any*): String = ${ showMeExpr('sc, 'args) }

private def showMeExpr(sc: Expr[StringContext], argsExpr: Expr[Seq[Any]])(using Quotes): Expr[String] =
import quotes.reflect.report
argsExpr match
case Varargs(argExprs) =>
val argShowedExprs = argExprs.map {
case '{ $arg: tp } =>
val showTp = Type.of[Show[tp]]
Expr.summon(using showTp) match
Expr.summon[Show[tp]] match
case Some(showExpr) =>
'{ $showExpr.show($arg) }
case None =>
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18 changes: 8 additions & 10 deletions tests/run-macros/string-context-implicits/Macro_1.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -3,26 +3,24 @@ import scala.quoted._

extension (sc: StringContext) inline def showMe(inline args: Any*): String = ${ showMeExpr('sc, 'args) }

private def showMeExpr(sc: Expr[StringContext], argsExpr: Expr[Seq[Any]])(using Quotes): Expr[String] = {
private def showMeExpr(sc: Expr[StringContext], argsExpr: Expr[Seq[Any]])(using Quotes): Expr[String] =
import quotes.reflect.report
argsExpr match {
argsExpr match
case Varargs(argExprs) =>
val argShowedExprs = argExprs.map {
case '{ $arg: tp } =>
val showTp = Type.of[Show[tp]]
Expr.summon(using showTp) match {
case Some(showExpr) => '{ $showExpr.show($arg) }
case None => report.error(s"could not find implicit for ${Type.show[Show[tp]]}", arg); '{???}
}
Expr.summon[Show[tp]] match
case Some(showExpr) =>
'{ $showExpr.show($arg) }
case None =>
report.error(s"could not find implicit for ${Type.show[Show[tp]]}", arg); '{???}
}
val newArgsExpr = Varargs(argShowedExprs)
'{ $sc.s($newArgsExpr: _*) }
case _ =>
// `new StringContext(...).showMeExpr(args: _*)` not an explicit `showMeExpr"..."`
report.error(s"Args must be explicit", argsExpr)
'{???}
}
}
'{ ??? }

trait Show[-T] {
def show(x: T): String
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