The current Dart SDK version is 2.4.0.                                  
                                                                        
    Because reflectable >=0.1.1 <2.0.2 requires SDK version >=1.8.0 <2.0.0-dev.infinity and reflectable >=2.0.2 <2.0.10 depends on source_span >=1.0.0 <1.5.0, reflectable >=0.1.1 <2.0.10 requires source_span >=1.0.0 <1.5.0.
(1) So, because reflectable >=2.0.9 depends on analyzer >=0.33.0 <0.35.0 and test_core >=0.2.2 <0.2.6 depends on analyzer >=0.35.3 <0.37.0, if test_core >=0.2.2 <0.2.6 and reflectable >=0.1.1 then source_span >=1.0.0 <1.5.0.
                                                                        
    Because test >=1.3.0 <1.6.1 depends on stream_channel ^1.6.0 and test >=1.6.1 <1.6.2 depends on test_core 0.2.3, test >=1.3.0 <1.6.2 requires stream_channel ^1.6.0 or test_core 0.2.3.
    And because test >=1.6.2 <1.6.3 depends on test_core 0.2.4, test >=1.3.0 <1.6.3 requires test_core 0.2.3 or 0.2.4 or stream_channel ^1.6.0.
    And because test >=1.6.4 depends on test_api 0.2.6 and test >=1.6.3 <1.6.4 depends on test_core 0.2.5, test >=1.3.0 requires test_core 0.2.3 or 0.2.4 or 0.2.5 or stream_channel ^1.6.0 or test_api 0.2.6.
    And because if test_core >=0.2.2 <0.2.6 and reflectable >=0.1.1 then source_span >=1.0.0 <1.5.0 (1), if reflectable >=0.1.1 and test >=1.3.0 then source_span >=1.0.0 <1.5.0 or stream_channel ^1.6.0 or test_api 0.2.6.
    And because every version of flutter_test from sdk depends on both source_span 1.5.5 and stream_channel 2.0.0, if reflectable >=0.1.1 and test >=1.3.0 and flutter_test any from sdk then test_api 0.2.6.
    And because every version of flutter_test from sdk depends on test_api 0.2.5 and reflected_mustache 1.0.11 depends on reflectable ^2.0.0, one of flutter_test any from sdk or test >=1.3.0 or reflected_mustache 1.0.11 must be false.
    And because no versions of reflected_mustache match >1.0.11 and mde_flutter depends on reflected_mustache >=1.0.11, flutter_test from sdk is incompatible with test >=1.3.0.
    So, because mde_flutter depends on both test >=1.5.3 and flutter_test any from sdk, version solving failed.
Running "flutter pub get" in mde_flutter...                             
pub get failed (1)