Unknown variable within should_be_null => NullPointerException in generator

[borisbrodski]

Using undefined variables in should be null or => null expressions produces no validation error and then a NullPointerException during code generation.

Example:

package bootstrap

describe "something"{
  fact "x" {
    abc should be null
  }
}

Caused by: java.lang.NullPointerException
    at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.getTypeForVariableDeclaration(AbstractXbaseCompiler.java:630)
    at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.declareFreshLocalVariable(AbstractXbaseCompiler.java:617)
    at org.eclipse.xtext.xbase.compiler.FeatureCallCompiler._toJavaStatement(FeatureCallCompiler.java:156)
    at org.jnario.compiler.JnarioCompiler._toJavaStatement(JnarioCompiler.java:444)
    at org.eclipse.xtext.xbase.compiler.FeatureCallCompiler._toJavaStatement(FeatureCallCompiler.java:253)
    at org.eclipse.xtext.xbase.compiler.FeatureCallCompiler.doInternalToJavaStatement(FeatureCallCompiler.java:101)
    at org.eclipse.xtext.xbase.compiler.XbaseCompiler.doInternalToJavaStatement(XbaseCompiler.java:405)
    at org.eclipse.xtend.core.compiler.XtendCompiler.doInternalToJavaStatement(XtendCompiler.java:348)
    at org.jnario.compiler.JnarioCompiler.doInternalToJavaStatement(JnarioCompiler.java:88)
    at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.internalToJavaStatement(AbstractXbaseCompiler.java:465)
    at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.toJavaStatement(AbstractXbaseCompiler.java:477)
    at org.jnario.compiler.JnarioCompiler._toShouldBeNullExpression(JnarioCompiler.java:153)
    at org.jnario.compiler.JnarioCompiler._toShouldExpression(JnarioCompiler.java:130)
    at org.jnario.compiler.JnarioCompiler._toJavaStatement(JnarioCompiler.java:124)
    at org.jnario.compiler.JnarioCompiler.doInternalToJavaStatement(JnarioCompiler.java:82)
    at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.internalToJavaStatement(AbstractXbaseCompiler.java:465)
    at org.eclipse.xtext.xbase.compiler.XbaseCompiler._toJavaStatement(XbaseCompiler.java:428)
    at org.eclipse.xtext.xbase.compiler.XbaseCompiler.doInternalToJavaStatement(XbaseCompiler.java:369)
    at org.eclipse.xtend.core.compiler.XtendCompiler.doInternalToJavaStatement(XtendCompiler.java:348)
    at org.jnario.compiler.JnarioCompiler.doInternalToJavaStatement(JnarioCompiler.java:88)
    at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.internalToJavaStatement(AbstractXbaseCompiler.java:465)
    at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.compile(AbstractXbaseCompiler.java:290)
    at org.eclipse.xtext.xbase.compiler.XbaseCompiler.toAnonymousClass(XbaseCompiler.java:1564)
    at org.eclipse.xtext.xbase.compiler.XbaseCompiler._toJavaStatement(XbaseCompiler.java:1526)
    at org.eclipse.xtext.xbase.compiler.XbaseCompiler.doInternalToJavaStatement(XbaseCompiler.java:373)
    at org.eclipse.xtend.core.compiler.XtendCompiler.doInternalToJavaStatement(XtendCompiler.java:348)
    at org.jnario.compiler.JnarioCompiler.doInternalToJavaStatement(JnarioCompiler.java:88)
    at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.internalToJavaStatement(AbstractXbaseCompiler.java:465)
    at org.eclipse.xtext.xbase.compiler.FeatureCallCompiler.prepareExpression(FeatureCallCompiler.java:431)
    at org.eclipse.xtext.xbase.compiler.FeatureCallCompiler._toJavaStatement(FeatureCallCompiler.java:135)
    at org.jnario.compiler.JnarioCompiler._toJavaStatement(JnarioCompiler.java:449)
    at org.eclipse.xtext.xbase.compiler.FeatureCallCompiler.doInternalToJavaStatement(FeatureCallCompiler.java:103)
    at org.eclipse.xtext.xbase.compiler.XbaseCompiler.doInternalToJavaStatement(XbaseCompiler.java:405)
    at org.eclipse.xtend.core.compiler.XtendCompiler.doInternalToJavaStatement(XtendCompiler.java:348)
    at org.jnario.compiler.JnarioCompiler.doInternalToJavaStatement(JnarioCompiler.java:88)
    at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.internalToJavaStatement(AbstractXbaseCompiler.java:465)
    at org.eclipse.xtext.xbase.compiler.XbaseCompiler._toJavaStatement(XbaseCompiler.java:430)
    at org.eclipse.xtext.xbase.compiler.XbaseCompiler.doInternalToJavaStatement(XbaseCompiler.java:369)
    at org.eclipse.xtend.core.compiler.XtendCompiler.doInternalToJavaStatement(XtendCompiler.java:348)
    at org.jnario.compiler.JnarioCompiler.doInternalToJavaStatement(JnarioCompiler.java:88)
    at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.internalToJavaStatement(AbstractXbaseCompiler.java:465)
    at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.compile(AbstractXbaseCompiler.java:290)
    at org.eclipse.xtext.xbase.compiler.AbstractXbaseCompiler.compile(AbstractXbaseCompiler.java:270)
    at org.eclipse.xtext.xbase.compiler.JvmModelGenerator.compile(JvmModelGenerator.java:1264)
    at org.eclipse.xtend.core.compiler.XtendGenerator.compile(XtendGenerator.java:193)
    at org.eclipse.xtext.xbase.compiler.JvmModelGenerator.generateExecutableBody(JvmModelGenerator.java:1230)
    at org.eclipse.xtext.xbase.compiler.JvmModelGenerator._generateMember(JvmModelGenerator.java:930)
    at org.eclipse.xtext.xbase.compiler.JvmModelGenerator.generateMember(JvmModelGenerator.java:2008)
    at org.eclipse.xtext.xbase.compiler.JvmModelGenerator$2.apply(JvmModelGenerator.java:317)
    at org.eclipse.xtext.xbase.compiler.JvmModelGenerator$2.apply(JvmModelGenerator.java:1)
    at org.eclipse.xtext.xbase.lib.ObjectExtensions.operator_doubleArrow(ObjectExtensions.java:139)
    at org.eclipse.xtext.xbase.compiler.LoopExtensions$1.apply(LoopExtensions.java:39)
    at org.eclipse.xtext.xbase.lib.IterableExtensions.forEach(IterableExtensions.java:399)
    at org.eclipse.xtext.xbase.compiler.LoopExtensions.forEach(LoopExtensions.java:42)
    at org.eclipse.xtext.xbase.compiler.JvmModelGenerator.generateMembersInBody(JvmModelGenerator.java:321)
    at org.eclipse.xtend.core.compiler.XtendGenerator.generateMembersInBody(XtendGenerator.java:429)
    at org.eclipse.xtext.xbase.compiler.JvmModelGenerator._generateBody(JvmModelGenerator.java:279)
    at org.eclipse.xtext.xbase.compiler.JvmModelGenerator.generateBody(JvmModelGenerator.java:1980)
    at org.eclipse.xtext.xbase.compiler.JvmModelGenerator.generateType(JvmModelGenerator.java:219)
    at org.jnario.compiler.JnarioStandaloneCompiler$9.apply(JnarioStandaloneCompiler.java:264)
    at org.jnario.compiler.JnarioStandaloneCompiler$9.apply(JnarioStandaloneCompiler.java:1)
    at org.eclipse.xtext.xbase.lib.IterableExtensions.forEach(IterableExtensions.java:399)
    at org.jnario.compiler.JnarioStandaloneCompiler.generateJavaFiles(JnarioStandaloneCompiler.java:277)
    at org.eclipse.xtend.core.compiler.batch.XtendBatchCompiler.compile(XtendBatchCompiler.java:399)
    at org.jnario.compiler.CompilerMain.compile(CompilerMain.java:91)
    at org.jnario.compiler.CompilerMain.main(CompilerMain.java:45)
    ... 5 more