Do not drop StructuredSources from internal dependencies

[xclaesse]

[lgtm-com[bot]]

This pull request introduces 2 alerts when merging 181144d751c5397302d84f7e7727aa961c7b0630 into bed5b31079823f1f2a05b43abd5b148d17c777aa - view on LGTM.com

new alerts:

• 2 for Wrong number of arguments in a class instantiation

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 20.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 44.28%. Comparing base (bed5b31) to head (8c4b028). Report is 1917 commits behind head on master.

Files	Patch %	Lines
mesonbuild/modules/rust.py	0.00%	3 Missing :warning:
mesonbuild/ast/introspection.py	0.00%	1 Missing :warning:

:exclamation: There is a different number of reports uploaded between BASE (bed5b31) and HEAD (8c4b028). Click for more details.

HEAD has 16 uploads less than BASE

Flag	BASE (bed5b31)	HEAD (8c4b028)
	19	3

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #10846       +/-   ##
===========================================
- Coverage   68.76%   44.28%   -24.48%     
===========================================
  Files         404      404               
  Lines       86651    86197      -454     
  Branches    19195    18377      -818     
===========================================
- Hits        59585    38172    -21413     
- Misses      22606    44488    +21882     
+ Partials     4460     3537      -923     

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[tristan957]

@dcbaker wanna take a moment to review this if you get a chance since you implemented this. Perhaps this might be important to Rust? Not sure.