Eliot Miranda uploaded a new version of System to project The Trunk:
http://source.squeak.org/trunk/System-eem.1389.mcz

==================== Summary ====================

Name: System-eem.1389
Author: eem
Time: 12 February 2023, 1:32:45.417157 pm
UUID: ccf5e3ec-c446-404a-88f4-ac3f8bb3ed29
Ancestors: System-mt.1388

Fix SystemNavigation>>#unusedBlocks to be bytecode set agnoistic.

=============== Diff against System-mt.1388 ===============

Item was changed:
  ----- Method: SystemNavigation>>unusedBlocks (in category 'query') -----
  unusedBlocks
  	"Answer all methods that contain a block that is not used (not
  	 sent a message, returned, passed as an argument, or assigned)."
  	"SystemNavigation new unusedBlocks"
  	"SystemNavigation new
  		browseMessageList: SystemNavigation new unusedBlocks
  		name: 'unused blocks'"
  
  	^self allMethodsSelect:
+ 		[:m|
+ 		(InstructionStream on: m)
+ 			scanForInstructionSequence:
+ 				[:a :b|
+ 				(#(pushClosureCopyNumCopiedValues:numArgs:blockSize: pushFullClosure:numCopied:) includes: a selector)
+ 				and: [b selector == #doPop]]]!
- 		[:m| | is |
- 		is := InstructionStream on: m.
- 		is scanFor: [:b| b = 143 and: [(m at: is thirdByte * 256 + is fourthByte + is pc + 4) = 135]]]!