I am seeing the following very annoying error in 50511 spur.

Open a Playground, 
type [ (both open en close are inserted, with the cursor in-between), 
type : (to start a block arg), 
boom:

RBParseErrorNode(Object)>>doesNotUnderstand: #isInstance
OCASTClosureAnalyzer>>changeVariableClass:
OCASTClosureAnalyzer>>visitArgumentNode:
[ :each | self visitArgumentNode: each ] in 
OCASTClosureAnalyzer(RBProgramNodeVisitor)>>visitArgumentNodes:
OrderedCollection>>do:
OCASTClosureAnalyzer(RBProgramNodeVisitor)>>visitArgumentNodes:
OCASTClosureAnalyzer>>visitBlockNode:
RBBlockNode>>acceptVisitor:
OCASTClosureAnalyzer(RBProgramNodeVisitor)>>visitNode:
[ :each | self visitNode: each ] in 
OCASTClosureAnalyzer(RBProgramNodeVisitor)>>visitSequenceNode:
OrderedCollection>>do:
OCASTClosureAnalyzer(RBProgramNodeVisitor)>>visitSequenceNode:
RBSequenceNode>>acceptVisitor:
OCASTClosureAnalyzer(RBProgramNodeVisitor)>>visitNode:
OCASTClosureAnalyzer>>visitMethodNode:
RBMethodNode>>acceptVisitor:
OCASTClosureAnalyzer(RBProgramNodeVisitor)>>visitNode:
OCASTSemanticAnalyzer>>analyze:
RBMethodNode>>doSemanticAnalysis
RBBlockNode(RBProgramNode)>>doSemanticAnalysis
RubSHTextStylerST80(SHRBTextStyler)>>privateStyle:
[ self privateStyle: text.
view ifNotNil: [ view stylerStyledInBackground: text ] ] in [ backgroundProcess 
:= [ self privateStyle: text.
view ifNotNil: [ view stylerStyledInBackground: text ] ]
        forkAt: Processor userBackgroundPriority ] in 
RubSHTextStylerST80(SHTextStyler)>>styleInBackgroundProcess:
[ self value.
Processor terminateActive ] in BlockClosure>>newProcess

Has this already been reported ?

It makes the image almost unusable...

Sven


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