Problems reported:

parser/error_recovery/method_called_with_prime2:5:11: Variables must be declared using the keywords 'const', 'final', 'var' or a type name.
class B {}foo
          ^^^

parser/error_recovery/method_called_with_prime2:5:11: Expected ';' after this.
class B {}foo
          ^^^

parser/error_recovery/method_called_with_prime2:6:11: Variables must be declared using the keywords 'const', 'final', 'var' or a type name.
class M1 {foo
          ^^^

parser/error_recovery/method_called_with_prime2:6:11: Expected ';' after this.
class M1 {foo
          ^^^

parser/error_recovery/method_called_with_prime2:7:3: Classes can't be declared inside other classes.
  class M2 {
  ^^^^^

beginCompilationUnit(class)
  beginMetadataStar(class)
  endMetadataStar(0)
  beginClassOrNamedMixinApplicationPrelude(class)
    handleIdentifier(B, classOrMixinDeclaration)
    handleNoTypeVariables({)
    beginClassDeclaration(class, null, B)
      handleNoType(B)
      handleClassExtends(null, 1)
      handleClassNoWithClause()
      handleClassOrMixinImplements(null, 0)
      handleClassHeader(class, class, null)
      beginClassOrMixinBody(DeclarationKind.Class, {)
      endClassOrMixinBody(DeclarationKind.Class, 0, {, })
    endClassDeclaration(class, })
  endTopLevelDeclaration(foo)
  beginMetadataStar(foo)
  endMetadataStar(0)
  beginTopLevelMember(foo)
    handleRecoverableError(MissingConstFinalVarOrType, foo, foo)
    handleNoType(})
    handleIdentifier(foo, topLevelVariableDeclaration)
    handleNoFieldInitializer(class)
    handleRecoverableError(Message[ExpectedAfterButGot, Expected ';' after this., null, {string: ;}], foo, foo)
  endTopLevelFields(null, null, null, null, null, 1, foo, ;)
endTopLevelDeclaration(class)
beginMetadataStar(class)
endMetadataStar(0)
beginClassOrNamedMixinApplicationPrelude(class)
  handleIdentifier(M1, classOrMixinDeclaration)
  handleNoTypeVariables({)
  beginClassDeclaration(class, null, M1)
    handleNoType(M1)
    handleClassExtends(null, 1)
    handleClassNoWithClause()
    handleClassOrMixinImplements(null, 0)
    handleClassHeader(class, class, null)
    beginClassOrMixinBody(DeclarationKind.Class, {)
      beginMetadataStar(foo)
      endMetadataStar(0)
      beginMember()
        handleRecoverableError(MissingConstFinalVarOrType, foo, foo)
        handleNoType({)
        handleIdentifier(foo, fieldDeclaration)
        handleNoFieldInitializer(class)
        handleRecoverableError(Message[ExpectedAfterButGot, Expected ';' after this., null, {string: ;}], foo, foo)
      endClassFields(null, null, null, null, null, null, 1, foo, ;)
    endMember()
    beginMetadataStar(class)
    endMetadataStar(0)
    beginMember()
      handleRecoverableError(ClassInClass, class, class)
      handleInvalidMember(class)
    endClassOrMixinBody(DeclarationKind.Class, 2, {, })
  endClassDeclaration(class, })
endTopLevelDeclaration()
endCompilationUnit(3, )