#413 Duplicated procedure throws an exception

[Marcel Schaible]

When accidentally defining a procedure twice, the compiler throwas an exception an termintes with the message "null".

The culprit is here:

java.lang.NullPointerException
    at org.openpearl.compiler.SymbolTableVisitor.differsOnlyInSpcDcl(SymbolTableVisitor.java:2147)
    at org.openpearl.compiler.SymbolTableVisitor.visitProcedureDeclaration(SymbolTableVisitor.java:409)
    at org.openpearl.compiler.SymbolTableVisitor.visitProcedureDeclaration(SymbolTableVisitor.java:81)
    at org.openpearl.compiler.OpenPearlParser$ProcedureDeclarationContext.accept(OpenPearlParser.java:3467)
    at org.antlr.v4.runtime.tree.AbstractParseTreeVisitor.visitChildren(AbstractParseTreeVisitor.java:46)
    at org.openpearl.compiler.OpenPearlBaseVisitor.visitProblem_part(OpenPearlBaseVisitor.java:89)
    at org.openpearl.compiler.OpenPearlParser$Problem_partContext.accept(OpenPearlParser.java:924)
    at org.antlr.v4.runtime.tree.AbstractParseTreeVisitor.visitChildren(AbstractParseTreeVisitor.java:46)
    at org.openpearl.compiler.SymbolTableVisitor.visitModule(SymbolTableVisitor.java:139)
    at org.openpearl.compiler.SymbolTableVisitor.visitModule(SymbolTableVisitor.java:81)
    at org.openpearl.compiler.OpenPearlParser$ModuleContext.accept(OpenPearlParser.java:401)
    at org.antlr.v4.runtime.tree.AbstractParseTreeVisitor.visitChildren(AbstractParseTreeVisitor.java:46)
    at org.openpearl.compiler.OpenPearlBaseVisitor.visitProgram(OpenPearlBaseVisitor.java:26)
    at org.openpearl.compiler.OpenPearlParser$ProgramContext.accept(OpenPearlParser.java:340)
    at org.antlr.v4.runtime.tree.AbstractParseTreeVisitor.visit(AbstractParseTreeVisitor.java:18)
    at org.openpearl.compiler.Compiler.main(Compiler.java:180)

java.lang.NullPointerException
    at org.openpearl.compiler.SymbolTableVisitor.differsOnlyInSpcDcl(SymbolTableVisitor.java:2147)
    at org.openpearl.compiler.SymbolTableVisitor.visitProcedureDeclaration(SymbolTableVisitor.java:409)
    at org.openpearl.compiler.SymbolTableVisitor.visitProcedureDeclaration(SymbolTableVisitor.java:81)
    at org.openpearl.compiler.OpenPearlParser$ProcedureDeclarationContext.accept(OpenPearlParser.java:3467)
    at org.antlr.v4.runtime.tree.AbstractParseTreeVisitor.visitChildren(AbstractParseTreeVisitor.java:46)
    at org.openpearl.compiler.OpenPearlBaseVisitor.visitProblem_part(OpenPearlBaseVisitor.java:89)
    at org.openpearl.compiler.OpenPearlParser$Problem_partContext.accept(OpenPearlParser.java:924)
    at org.antlr.v4.runtime.tree.AbstractParseTreeVisitor.visitChildren(AbstractParseTreeVisitor.java:46)
    at org.openpearl.compiler.SymbolTableVisitor.visitModule(SymbolTableVisitor.java:139)
    at org.openpearl.compiler.SymbolTableVisitor.visitModule(SymbolTableVisitor.java:81)
    at org.openpearl.compiler.OpenPearlParser$ModuleContext.accept(OpenPearlParser.java:401)
    at org.antlr.v4.runtime.tree.AbstractParseTreeVisitor.visitChildren(AbstractParseTreeVisitor.java:46)
    at org.openpearl.compiler.OpenPearlBaseVisitor.visitProgram(OpenPearlBaseVisitor.java:26)
    at org.openpearl.compiler.OpenPearlParser$ProgramContext.accept(OpenPearlParser.java:340)
    at org.antlr.v4.runtime.tree.AbstractParseTreeVisitor.visit(AbstractParseTreeVisitor.java:18)
    at org.openpearl.compiler.Compiler.main(Compiler.java:180)

[Rainer Müller]

I could not reproduce the effect
--> ticket is open and not assigned