Fixed bug, thanks to Lena

CHANGELOG.md

 # Change Log for PseuCo to CCS Compiler
 
+##0.8.10 - 2020-06-09
+
+### Fixed
+
+- Send expressions with unbuffered channels could not be used as RHS expression of assignments. The container holding the sent value was not protected during transition to the followup process.
+
 ##0.8.9 - 2019-05-31
 
 ### Fixed

src/PCCCompiler.coffee

@@ -133,7 +133,18 @@ class PCCCompiler 		# ToDo: Allow assigning a recently used program controller (
 				sysDefs.push(def)
 		procDefs[0].insertLinesBefore = 1 if procDefs.length > 0 and sysDefs.length > 0
 		mainAgentDefs[0].insertLinesBefore = 1 if mainAgentDefs.length > 0 and (procDefs.length > 0 or sysDefs.length > 0)
-		new CCS.CCS(sysDefs.concat(procDefs).concat(mainAgentDefs), @_getSystem())
+		allPdefs = sysDefs.concat(procDefs).concat(mainAgentDefs)
+		system = @_getSystem()
+		#@__dumpUncheckedCCS(allPdefs, system)
+		new CCS.CCS(allPdefs, system)
+	
+	__dumpUncheckedCCS: (pdefs, system) ->
+		console.log('Dumping unchecked CCS.')
+		res = ''
+		(res += pd.toString() + "\n") for pd in pdefs
+		res += "\n#{system.toString()}"
+		console.log(res)
+		res
 	
 	__assertEmptyGroupStack: -> 
 		if @groupElements.length > 0 

src/PseuCo+Compiler.coffee

@@ -154,7 +154,7 @@ PC.StartExpression::compile = (compiler) ->
 	
 
 PC.AssignExpression::compile = (compiler) ->
-	c = compiler.compile(@getExpression())
+	c = compiler.compile(@getExpression())	
 	if @operator == "+="
 		c = new PCCBinaryContainer(compiler.compile(@getDestination()), c, "+")
 	else if @operator == "-="
@@ -221,6 +221,7 @@ PC.SendExpression::compile = (compiler) ->
 		c = compiler.compile(@children[0])
 		v = compiler.compile(@children[1])
 	if @children[0].getType(compiler).capacity <= 0
+		compiler.protectContainer(v)
 		control = compiler.emitChoice()
 		compiler.emitCondition(new PCCBinaryContainer(c, new PCCConstantContainer(0), ">="))
 		compiler.emitOutput("put", c, v)	# Buffered
@@ -231,6 +232,7 @@ PC.SendExpression::compile = (compiler) ->
 		p2 = compiler.emitProcessApplicationPlaceholder()
 		control.setBranchFinished()
 		compiler.emitMergeOfProcessFramesOfPlaceholders([p1, p2])
+		v = compiler.unprotectContainer()
 	else
 		compiler.emitOutput("put", c, v)	# Buffered
 	v