Chained assignment of mock service fails to compile

Originally reported on Google Code with ID 161

In a Spec extending grails.plugin.spock.ControllerSpec, attempt to chain assignment
of a Mock() to the controller field and then a local variable.

eg
    AccountService accountService = controller.accountService = Mock()

This gives a Spock compilation failure.  The stack trace is below.

The equivalent statements
    AccountService accountService = Mock()
    controller.accountService = accountService
work correctly.

This is using the spock-0.5-groovy-1.7-SNAPSHOT plugin with the geb-0.4 plugin and
Grails 1.3.5, which uses groovy 1.7.5.

Stack trace:
Unexpected error during compilation of spec 'app.TransactionControllerSpec'. Maybe
you have used invalid Spock syntax? Anyway, please file a bug report at http://issues.spockframework.org.
java.lang.NullPointerException
    at org.spockframework.compiler.AstUtil.getType(AstUtil.java:275)
    at org.spockframework.compiler.AstUtil.expandBuiltinMemberAssignment(AstUtil.java:260)
    at org.spockframework.compiler.DeepStatementRewriter.visitBinaryExpression(DeepStatementRewriter.java:142)
    at org.spockframework.compiler.DeepStatementRewriter.visitDeclarationExpression(DeepStatementRewriter.java:135)
    at org.codehaus.groovy.ast.expr.DeclarationExpression.visit(DeclarationExpression.java:53)
    at org.codehaus.groovy.ast.CodeVisitorSupport.visitExpressionStatement(CodeVisitorSupport.java:69)
    at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitExpressionStatement(ClassCodeVisitorSupport.java:195)
    at org.spockframework.compiler.DeepStatementRewriter.visitExpressionStatement(DeepStatementRewriter.java:73)
    at org.codehaus.groovy.ast.stmt.ExpressionStatement.visit(ExpressionStatement.java:40)
    at org.spockframework.compiler.StatementReplacingVisitorSupport.replace(StatementReplacingVisitorSupport.java:44)
    at org.spockframework.compiler.StatementReplacingVisitorSupport.replaceAll(StatementReplacingVisitorSupport.java:59)
    at org.spockframework.compiler.DeepStatementRewriter.visitBlock(DeepStatementRewriter.java:60)
    at org.spockframework.compiler.SpecRewriter.visitAnyBlock(SpecRewriter.java:400)
    at org.spockframework.compiler.model.AnonymousBlock.accept(AnonymousBlock.java:32)
    at org.spockframework.compiler.model.Method.accept(Method.java:70)
    at org.spockframework.compiler.model.Spec.accept(Spec.java:102)
    at org.spockframework.compiler.SpockTransform$ActualTransform.processSpec(SpockTransform.java:76)
    at org.spockframework.compiler.SpockTransform$ActualTransform.visit(SpockTransform.java:63)
    at org.spockframework.compiler.SpockTransform.visit(SpockTransform.java:46)
    at org.codehaus.groovy.transform.ASTTransformationVisitor$3.call(ASTTransformationVisitor.java:302)
    at org.codehaus.groovy.control.CompilationUnit.applyToSourceUnits(CompilationUnit.java:814)
    at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:511)
    at org.codehaus.groovy.control.CompilationUnit.processPhaseOperations(CompilationUnit.java:487)
    at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:464)
    at org.jetbrains.groovy.compiler.rt.GroovyCompilerWrapper.compile(GroovyCompilerWrapper.java:43)
    at org.jetbrains.groovy.compiler.rt.GroovycRunner.main(GroovycRunner.java:128)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.intellij.rt.execution.CommandLineWrapper.main(CommandLineWrapper.java:75)

Reported by boocockp on 2010-12-17 06:43:01

Start with AstUtil.getType and expandBuiltinMemberAssignment, then trace the declaration handling in DeepStatementRewriter.visitBinaryExpression and visitDeclarationExpression. Reproduce the chained assignment from the issue using the stated Spock and Groovy versions. Done means the declaration compiles successfully while the equivalent two statements continue to work.