Fixing exhaustiveness warnings.

ClassfileAnnotArg becoming sealed brought tidings of not being
exhaustive.

Author: paulp

src/compiler/scala/reflect/reify/codegen/GenAnnotationInfos.scala

@@ -45,6 +45,8 @@ trait GenAnnotationInfos {
         mirrorFactoryCall(nme.ArrayAnnotArg, scalaFactoryCall(nme.Array, args map reifyClassfileAnnotArg: _*))
       case NestedAnnotArg(ann) =>
         mirrorFactoryCall(nme.NestedAnnotArg, reifyAnnotationInfo(ann))
+      case _ =>
+        sys.error(s"Don't know what to do with $arg")
     }
 
     // if you reify originals of anns, you get SO when trying to reify AnnotatedTypes, so screw it - after all, it's not that important

src/compiler/scala/reflect/reify/phases/Reshape.scala

@@ -231,13 +231,10 @@ trait Reshape {
       val args = if (ann.assocs.isEmpty) {
         ann.args
       } else {
-        def toScalaAnnotation(jann: ClassfileAnnotArg): Tree = jann match {
-          case LiteralAnnotArg(const) =>
-            Literal(const)
-          case ArrayAnnotArg(arr) =>
-            Apply(Ident(definitions.ArrayModule), arr.toList map toScalaAnnotation)
-          case NestedAnnotArg(ann) =>
-            toPreTyperAnnotation(ann)
+        def toScalaAnnotation(jann: ClassfileAnnotArg): Tree = (jann: @unchecked) match {
+          case LiteralAnnotArg(const) => Literal(const)
+          case ArrayAnnotArg(arr)     => Apply(Ident(definitions.ArrayModule), arr.toList map toScalaAnnotation)
+          case NestedAnnotArg(ann)    => toPreTyperAnnotation(ann)
         }
 
         ann.assocs map { case (nme, arg) => AssignOrNamedArg(Ident(nme), toScalaAnnotation(arg)) }

src/compiler/scala/tools/nsc/backend/jvm/BCodeHelpers.scala

@@ -654,7 +654,7 @@ abstract class BCodeHelpers extends BCodeTypes with BytecodeWriters {
     def emitArgument(av:   asm.AnnotationVisitor,
                      name: String,
                      arg:  ClassfileAnnotArg) {
-      arg match {
+      (arg: @unchecked) match {
 
         case LiteralAnnotArg(const) =>
           if (const.isNonUnitAnyVal) { av.visit(name, const.value) }

src/compiler/scala/tools/nsc/backend/jvm/GenASM.scala

@@ -932,7 +932,7 @@ abstract class GenASM extends SubComponent with BytecodeWriters with GenJVMASM {
     def emitArgument(av:   asm.AnnotationVisitor,
                      name: String,
                      arg:  ClassfileAnnotArg) {
-      arg match {
+      (arg: @unchecked) match {
 
         case LiteralAnnotArg(const) =>
           if(const.isNonUnitAnyVal) { av.visit(name, const.value) }

src/compiler/scala/tools/nsc/symtab/classfile/Pickler.scala

@@ -486,14 +486,10 @@ abstract class Pickler extends SubComponent {
         }
       }
       def putClassfileAnnotArg(carg: ClassfileAnnotArg) {
-        carg match {
-          case LiteralAnnotArg(const) =>
-            putConstant(const)
-          case ArrayAnnotArg(args) =>
-            if (putEntry(carg))
-              args foreach putClassfileAnnotArg
-          case NestedAnnotArg(annInfo) =>
-            putAnnotation(annInfo)
+        (carg: @unchecked) match {
+          case LiteralAnnotArg(const)  => putConstant(const)
+          case ArrayAnnotArg(args)     => if (putEntry(carg)) args foreach putClassfileAnnotArg
+          case NestedAnnotArg(annInfo) => putAnnotation(annInfo)
         }
       }
       val AnnotationInfo(tpe, args, assocs) = annot
@@ -559,13 +555,10 @@ abstract class Pickler extends SubComponent {
 
     /** Write a ClassfileAnnotArg (argument to classfile annotation) */
     def writeClassfileAnnotArg(carg: ClassfileAnnotArg) {
-      carg match {
-        case LiteralAnnotArg(const) =>
-          writeRef(const)
-        case ArrayAnnotArg(args) =>
-          writeRef(carg)
-        case NestedAnnotArg(annInfo) =>
-          writeRef(annInfo)
+      (carg: @unchecked) match {
+        case LiteralAnnotArg(const)  => writeRef(const)
+        case ArrayAnnotArg(args)     => writeRef(carg)
+        case NestedAnnotArg(annInfo) => writeRef(annInfo)
       }
     }
 

src/reflect/scala/reflect/internal/Importers.scala

@@ -434,6 +434,8 @@ trait Importers extends api.Importers { to: SymbolTable =>
         ScalaSigBytes(bytes)
       case from.NestedAnnotArg(annInfo) =>
         NestedAnnotArg(importAnnotationInfo(annInfo))
+      case from.UnmappableAnnotArg =>
+        UnmappableAnnotArg
     }
 
     // todo. careful import of positions