Introduces a new syntax for invoking the finalize block.

[d0cd]

The existing syntax for invoking the finalize block is async finalize(<args>);.
This syntax is being deprecated in favor of return <expr> then finalize(<args>);.

TODO:

• More tests.
• Deprecation error for async.

[codecov]

Codecov Report

Merging #2172 (f6f286a) into testnet3 (9e28591) will increase coverage by 0.18%.
The diff coverage is 95.95%.

@@             Coverage Diff              @@
##           testnet3    #2172      +/-   ##
============================================
+ Coverage     82.77%   82.95%   +0.18%     
============================================
  Files           149      148       -1     
  Lines          7226     7205      -21     
  Branches       7226     7205      -21     
============================================
- Hits           5981     5977       -4     
+ Misses         1245     1228      -17     

Impacted Files	Coverage Δ
compiler/ast/src/passes/consumer.rs	86.20% <ø> (-0.46%)	⬇️
compiler/ast/src/passes/visitor.rs	85.71% <ø> (ø)
compiler/ast/src/statement/mod.rs	46.34% <ø> (+3.15%)	⬆️
compiler/parser/src/tokenizer/mod.rs	100.00% <ø> (ø)
compiler/passes/src/flattening/flatten_program.rs	97.29% <ø> (+1.14%)	⬆️
compiler/passes/src/type_checking/checker.rs	94.08% <ø> (ø)
compiler/span/src/symbol.rs	94.52% <ø> (ø)
compiler/parser/src/tokenizer/token.rs	65.86% <50.00%> (-0.20%)	⬇️
...s/src/static_single_assignment/rename_statement.rs	91.66% <87.50%> (+0.40%)	⬆️
compiler/parser/src/parser/statement.rs	97.54% <93.75%> (-0.48%)	⬇️
... and 12 more

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[bendyarm]

I see async was removed from this tokenizer test but it is still in lexer.rs on line 397, is that so that it can detect the deprecated feature and report on it? If so maybe it should remain in the tokenizer test until taken out of the lexer?

[bendyarm]

Looks good to me.