Eliot Miranda uploaded a new version of Kernel to project The Trunk:
http://source.squeak.org/trunk/Kernel-eem.1076.mcz

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

Name: Kernel-eem.1076
Author: eem
Time: 30 March 2017, 1:56:08.159569 pm
UUID: 5bd0442e-e498-4794-a357-40629712f858
Ancestors: Kernel-eem.1075

Add the method to bootstrap MethodContext => Context (to the class side of InstructionStream so its not going to move).  Make sure the old name is still around until after the putsch.

=============== Diff against Kernel-eem.1075 ===============

Item was added:
+ ----- Method: InstructionStream class>>bootstrapContext (in category 'bootstrap context') -----
+ bootstrapContext
+ 	"Rename MethodContext to Context."
+ 	"InstructionStream bootstrapContext"
+ 	thisContext class name = #Context ifTrue:
+ 		[self assert: (Smalltalk classNamed: #MethodContext) == thisContext class.
+ 		 self assert: (Smalltalk classNamed: #Context) == thisContext class.
+ 		 ^self].
+ 	MethodContext ensureClassPool.
+ 	MethodContext classPool addAll: ContextPart classPool associations.
+ 	MethodContext superclass: InstructionStream.
+ 	MethodContext class superclass: InstructionStream class.
+ 	InstructionStream addSubclass: MethodContext.
+ 	MethodContext
+ 		setInstVarNames: ContextPart instVarNames, MethodContext instVarNames;
+ 		rename: #Context.
+ 	Smalltalk at: #MethodContext ifAbsentPut: [Smalltalk classNamed: #Context].
+ 	self assert: (Smalltalk classNamed: #MethodContext) == thisContext class.
+ 	self assert: (Smalltalk classNamed: #Context) == thisContext class!