Remove extra indentation in core try except

[JSAbrahams]

Relevant issues

Closes #322

[codecov[bot]]

Codecov Report

Merging #326 (08ec7fc) into develop (ed9a647) will decrease coverage by 0.25%. The diff coverage is 84.47%.

@@             Coverage Diff             @@
##           develop     #326      +/-   ##
===========================================
- Coverage    87.23%   86.97%   -0.26%     
===========================================
  Files          105      104       -1     
  Lines        11335    11424      +89     
===========================================
+ Hits          9888     9936      +48     
- Misses        1447     1488      +41     

Impacted Files	Coverage Δ
src/check/ast/node.rs	95.43% <ø> (-0.06%)	:arrow_down:
src/check/constrain/generate/mod.rs	90.16% <ø> (-0.16%)	:arrow_down:
src/check/constrain/generate/ty.rs	0.00% <0.00%> (ø)
src/check/name/truename/generic.rs	62.96% <0.00%> (ø)
src/check/constrain/unify/expression/mod.rs	80.55% <33.33%> (ø)
src/check/context/arg/generic.rs	72.83% <37.50%> (ø)
src/check/constrain/generate/statement.rs	81.25% <50.00%> (ø)
src/check/context/parent/generic.rs	78.57% <50.00%> (ø)
src/check/name/stringname/generic.rs	93.33% <50.00%> (ø)
src/generate/result.rs	23.33% <50.00%> (ø)
... and 73 more

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