The following BasicCompilerEmitTest unit tests fail when run under the es-ES locale:

• Microsoft.CodeAnalysis.VisualBasic.UnitTests.CodeGenRefReturnTests.RefReturnLateBoundCall
  Message

  Roslyn.Test.Utilities.ExecutionException : 
  Execution failed for assembly 'D:\\j\\workspace\\windows_debug---3e75d4cf\\Binaries\\Temp\\'.
  Expected: Public member 'G' on type 'A' not found.
  Actual:   No se encuentra el miembro público 'G' en el tipo 'A'.
  

  Stack trace

   en Roslyn.Test.Utilities.Desktop.DesktopRuntimeEnvironment.Execute(String moduleName, String[] args, String expectedOutput)
   en Microsoft.CodeAnalysis.Test.Utilities.CompilationVerifier.Emit(String expectedOutput, Nullable`1 expectedReturnCode, String[] args, IEnumerable`1 manifestResources, EmitOptions emitOptions, Verification peVerify, SignatureDescription[] expectedSignatures)
   en Microsoft.CodeAnalysis.Test.Utilities.CommonTestBase.Emit(Compilation compilation, IEnumerable`1 dependencies, IEnumerable`1 manifestResources, SignatureDescription[] expectedSignatures, String expectedOutput, Nullable`1 expectedReturnCode, String[] args, Action`1 assemblyValidator, Action`1 symbolValidator, EmitOptions emitOptions, Verification verify)
   en Microsoft.CodeAnalysis.Test.Utilities.CommonTestBase.CompileAndVerifyCommon(Compilation compilation, IEnumerable`1 manifestResources, IEnumerable`1 dependencies, Action`1 sourceSymbolValidator, Action`1 assemblyValidator, Action`1 symbolValidator, SignatureDescription[] expectedSignatures, String expectedOutput, Nullable`1 expectedReturnCode, String[] args, EmitOptions emitOptions, Verification verify)
   en Microsoft.CodeAnalysis.VisualBasic.UnitTests.BasicTestBase.CompileAndVerify(Compilation compilation, IEnumerable`1 manifestResources, IEnumerable`1 dependencies, Action`1 sourceSymbolValidator, Action`1 validator, Action`1 symbolValidator, SignatureDescription[] expectedSignatures, String expectedOutput, Nullable`1 expectedReturnCode, String[] args, EmitOptions emitOptions, Verification verify)
   en Microsoft.CodeAnalysis.VisualBasic.UnitTests.CodeGenRefReturnTests.RefReturnLateBoundCall()
  

Full details in Roslyn.Compilers.VisualBasic.Emit.UnitTests.dll.zip