[Merged by Bors] - Allow class expressions without identifier

[raskad]

This Pull Request changes the following:

• Remove false early error when a class expression was missing a binding identifier.
• Simplify/fix environment truncation on function returns.

The new failed tests where false positives before that will be fixed in another PR.

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	93,831	93,831	0
Passed	69,664	69,704	+40
Ignored	18,472	18,472	0
Failed	5,695	5,655	-40
Panics	0	0	0
Conformance	74.24%	74.29%	+0.04%

Fixed tests (44):

test/language/expressions/class/name.js [strict mode] (previously Failed)
test/language/expressions/class/name.js (previously Failed)
test/language/expressions/class/accessor-name-static/computed-err-evaluation.js [strict mode] (previously Failed)
test/language/expressions/class/accessor-name-static/computed-err-evaluation.js (previously Failed)
test/language/expressions/class/accessor-name-static/computed-err-unresolvable.js [strict mode] (previously Failed)
test/language/expressions/class/accessor-name-static/computed-err-unresolvable.js (previously Failed)
test/language/expressions/class/accessor-name-static/computed-err-to-prop-key.js [strict mode] (previously Failed)
test/language/expressions/class/accessor-name-static/computed-err-to-prop-key.js (previously Failed)
test/language/expressions/class/accessor-name-inst/computed-err-evaluation.js [strict mode] (previously Failed)
test/language/expressions/class/accessor-name-inst/computed-err-evaluation.js (previously Failed)
test/language/expressions/class/accessor-name-inst/computed-err-unresolvable.js [strict mode] (previously Failed)
test/language/expressions/class/accessor-name-inst/computed-err-unresolvable.js (previously Failed)
test/language/expressions/class/accessor-name-inst/computed-err-to-prop-key.js [strict mode] (previously Failed)
test/language/expressions/class/accessor-name-inst/computed-err-to-prop-key.js (previously Failed)
test/language/expressions/object/fn-name-class.js [strict mode] (previously Failed)
test/language/expressions/object/fn-name-class.js (previously Failed)
test/language/statements/class/elements/privatefieldset-typeerror-2.js [strict mode] (previously Failed)
test/language/statements/class/elements/privatefieldset-typeerror-2.js (previously Failed)
test/language/statements/class/elements/privatefieldset-typeerror-3.js [strict mode] (previously Failed)
test/language/statements/class/elements/privatefieldset-typeerror-3.js (previously Failed)
test/language/statements/class/elements/privatefieldget-success-1.js [strict mode] (previously Failed)
test/language/statements/class/elements/privatefieldget-success-1.js (previously Failed)
test/language/statements/class/elements/privatefieldget-typeerror-2.js [strict mode] (previously Failed)
test/language/statements/class/elements/privatefieldget-typeerror-2.js (previously Failed)
test/language/statements/class/elements/privatefieldget-typeerror-3.js [strict mode] (previously Failed)
test/language/statements/class/elements/privatefieldget-typeerror-3.js (previously Failed)
test/language/statements/class/subclass/derived-class-return-override-catch-super-arrow.js [strict mode] (previously Failed)
test/language/statements/class/subclass/derived-class-return-override-catch-super-arrow.js (previously Failed)
test/language/statements/class/subclass/derived-class-return-override-finally-super.js [strict mode] (previously Failed)
test/language/statements/class/subclass/derived-class-return-override-finally-super.js (previously Failed)
test/language/statements/class/subclass/derived-class-return-override-finally-super-arrow.js [strict mode] (previously Failed)
test/language/statements/class/subclass/derived-class-return-override-finally-super-arrow.js (previously Failed)
test/language/statements/class/subclass/derived-class-return-override-catch.js [strict mode] (previously Failed)
test/language/statements/class/subclass/derived-class-return-override-catch.js (previously Failed)
test/language/statements/class/subclass/derived-class-return-override-catch-super.js [strict mode] (previously Failed)
test/language/statements/class/subclass/derived-class-return-override-catch-super.js (previously Failed)
test/language/statements/class/subclass/derived-class-return-override-catch-finally-arrow.js [strict mode] (previously Failed)
test/language/statements/class/subclass/derived-class-return-override-catch-finally-arrow.js (previously Failed)
test/language/statements/class/subclass/derived-class-return-override-catch-finally.js [strict mode] (previously Failed)
test/language/statements/class/subclass/derived-class-return-override-catch-finally.js (previously Failed)
test/built-ins/Function/internals/Call/class-ctor-realm.js [strict mode] (previously Failed)
test/built-ins/Function/internals/Call/class-ctor-realm.js (previously Failed)
test/built-ins/Function/internals/Construct/derived-return-val-realm.js [strict mode] (previously Failed)
test/built-ins/Function/internals/Construct/derived-return-val-realm.js (previously Failed)

Broken tests (4):

test/language/expressions/class/static-gen-method-param-dflt-yield.js [strict mode] (previously Passed)
test/language/expressions/class/static-gen-method-param-dflt-yield.js (previously Passed)
test/language/expressions/class/gen-method-param-dflt-yield.js [strict mode] (previously Passed)
test/language/expressions/class/gen-method-param-dflt-yield.js (previously Passed)

[codecov]

Codecov Report

Merging #2464 (bac9b98) into main (9b56912) will increase coverage by 0.02%.
The diff coverage is 46.66%.

@@            Coverage Diff             @@
##             main    #2464      +/-   ##
==========================================
+ Coverage   51.04%   51.06%   +0.02%     
==========================================
  Files         345      346       +1     
  Lines       35963    35954       -9     
==========================================
+ Hits        18356    18359       +3     
+ Misses      17607    17595      -12     

Impacted Files	Coverage Δ
.../parser/expression/primary/class_expression/mod.rs	0.00% <0.00%> (ø)
boa_engine/src/vm/code_block.rs	33.14% <50.00%> (+0.04%)	⬆️
boa_wasm/src/lib.rs	0.00% <0.00%> (ø)
boa_engine/src/object/mod.rs	46.28% <0.00%> (+0.10%)	⬆️
boa_engine/src/value/display.rs	87.31% <0.00%> (+0.74%)	⬆️
boa_engine/src/environments/runtime.rs	48.76% <0.00%> (+1.41%)	⬆️

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[raskad]

bors r+

[bors]

Pull request successfully merged into main.

Build succeeded:

• Build and Test (macos-latest)
• Build and Test (windows-latest)
• Coverage
• Misc