WIP: Query2 test make variables get consumed

[johan-bjareholt]

ToDo:

• & should mean reference, right now it means clone to get tests working
• Make "read-only reference" a part of the language

[codecov]

Codecov Report

Merging #122 into master will decrease coverage by 0.06%.
The diff coverage is 81.81%.

@@            Coverage Diff             @@
##           master     #122      +/-   ##
==========================================
- Coverage   65.89%   65.82%   -0.07%     
==========================================
  Files          52       52              
  Lines        5864     5870       +6     
==========================================
  Hits         3864     3864              
- Misses       2000     2006       +6     

Impacted Files	Coverage Δ
aw-query/src/ast.rs	0.00% <0.00%> (ø)
aw-query/tests/query.rs	90.02% <ø> (ø)
aw-query/src/interpret.rs	81.13% <83.33%> (-0.16%)	⬇️
aw-query/src/lexer.rs	85.71% <100.00%> (+0.20%)	⬆️
aw-query/src/parser.rs	30.53% <100.00%> (-0.09%)	⬇️
aw-query/src/functions.rs	88.85% <0.00%> (-0.61%)	⬇️
aw-query/src/datatype.rs	78.64% <0.00%> (-0.53%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 132370b...c423321. Read the comment docs.