Various checks for constant expressions.

tests/co19/co19-kernel.status

Index: tests/co19/co19-kernel.status
diff --git a/tests/co19/co19-kernel.status b/tests/co19/co19-kernel.status
index 5fc904fb3b9df9171db20ce0c40822fe395f2512..afc1efb087c620ef81ba25bcc485e78b773aa171 100644
--- a/tests/co19/co19-kernel.status
+++ b/tests/co19/co19-kernel.status
@@ -81,7 +81,6 @@ Language/Expressions/Constants/depending_on_itself_t03: Crash
 Language/Expressions/Constants/equals_expression_t03: MissingCompileTimeError
 Language/Expressions/Constants/exception_t04: MissingCompileTimeError
 Language/Expressions/Constants/literal_string_t02: MissingCompileTimeError
-Language/Expressions/Constants/literal_string_t05: MissingCompileTimeError
 Language/Expressions/Constants/logical_expression_t02: MissingCompileTimeError
 Language/Expressions/Constants/logical_expression_t03: MissingCompileTimeError
 Language/Expressions/Constants/logical_expression_t04: MissingCompileTimeError
@@ -89,7 +88,6 @@ Language/Expressions/Constants/math_operators_t04: Crash
 Language/Expressions/Constants/math_operators_t05: Crash
 Language/Expressions/Constants/no_other_constant_expressions_t10: MissingCompileTimeError
 Language/Expressions/Constants/no_other_constant_expressions_t11: Crash
-Language/Expressions/Constants/string_length_t03: MissingCompileTimeError
 Language/Expressions/Constants/ternary_operator_t02: MissingCompileTimeError
 Language/Expressions/Function_Invocation/Binding_Actuals_to_Formals/same_name_arguments_t01: MissingCompileTimeError
 Language/Expressions/Function_Invocation/Unqualified_Invocation/instance_context_invocation_t03: MissingCompileTimeError
@@ -232,7 +230,6 @@ Language/Statements/Switch/expressions_t01: MissingCompileTimeError
 Language/Statements/Switch/expressions_t02: MissingCompileTimeError
 Language/Statements/Switch/expressions_t03: MissingCompileTimeError
 Language/Statements/Switch/expressions_t04: MissingCompileTimeError
-Language/Statements/Switch/labels_constants_t01: MissingCompileTimeError
 Language/Statements/Switch/syntax_t16: MissingCompileTimeError
 Language/Statements/Switch/syntax_t17: MissingCompileTimeError
 Language/Statements/Try/malformed_type_t04: RuntimeError