Problems reported:

parser/error_recovery/issue_42229_prime_6:1:7: The const variable 'foo' must be initialized.
const foo
      ^^^

parser/error_recovery/issue_42229_prime_6:1:7: Expected ';' after this.
const foo
      ^^^

beginCompilationUnit(const)
  beginMetadataStar(const)
  endMetadataStar(0)
  beginTopLevelMember(const)
    beginFields(DeclarationKind.TopLevel, null, null, null, null, null, const, )
      handleNoType(const)
      handleIdentifier(foo, topLevelVariableDeclaration)
      handleRecoverableError(Message[ConstFieldWithoutInitializer, The const variable 'foo' must be initialized., Try adding an initializer ('= expression') to the declaration., {name: foo}], foo, foo)
      handleNoFieldInitializer()
      handleRecoverableError(Message[ExpectedAfterButGot, Expected ';' after this., null, {string: ;}], foo, foo)
    endTopLevelFields(null, null, null, null, const, 1, const, ;)
  endTopLevelDeclaration()
endCompilationUnit(1, )