Import syn types explicitly

[Fluxie]

Syn exports its own Result type which conflicts with the standard Result type leading to compilation errors.

[codecov-io]

Codecov Report

Merging #110 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #110      +/-   ##
==========================================
- Coverage   81.37%   81.35%   -0.02%     
==========================================
  Files          57       57              
  Lines        5068     5068              
==========================================
- Hits         4124     4123       -1     
- Misses        944      945       +1

Impacted Files	Coverage Δ
intercom-common/src/attributes/com_interface.rs	96.82% <ø> (ø)	⬆️
intercom-common/src/attributes/com_impl.rs	100% <ø> (ø)	⬆️
intercom-common/src/ast_converters.rs	38.27% <ø> (ø)	⬆️
intercom-common/src/returnhandlers.rs	85.71% <ø> (ø)	⬆️
intercom-common/src/attributes/com_class.rs	100% <ø> (ø)	⬆️
intercom-common/src/methodinfo.rs	90.77% <100%> (ø)	⬆️
intercom-common/src/lib.rs	0% <0%> (-100%)	⬇️

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[Rantanen]

Oh, this explains why it was working on my system. Cargo.lock must have prevented Syn updates. Thanks!