Tests using toString on a run-time type cannot work with minification

[eernstg]

The following tests in sdk/tests/language_2 use e.toString() to get a string representation of a given run-time type (e has type Type), and compares the result to string literals:

cyclic_type2_test
cyclic_type_test/0*
f_bounded_quantification5_test
generic_closure_test
mixin_mixin2_test
mixin_mixin3_test
mixin_mixin4_test
mixin_mixin5_test
mixin_mixin6_test
mixin_mixin_bound2_test
mixin_mixin_bound_test

As mentioned in issue #12605, no guarantees are given for the return value of toString, including the one on Type, and in particular the output looks very different for user-defined classes and for the class Map in $minified mode.

Only generic_closure_test avoids user-defined classes and Map, so it may work, but the others will inherently fail with $minified.

This issue exists to make sure this situation is known, and it may be used to track an update to the tests (if that's given priority). I haven't given the issue area-dart2js because this is a problem with the tests, not with dart2js.

[eernstg]

Note that #31053 was created in response to the same problem that this issue addresses, and it was closed because this issue subsumes #31053.