SymbolChecks (ANTLR 4 Tool 4.0-rc-1 API)

```
public class SymbolChecks
extends Object
```
Check for symbol problems; no side-effects. Inefficient to walk rules and such multiple times, but I like isolating all error checking outside of code that actually defines symbols etc... Side-effect: strip away redef'd rules.

Fields
Modifier and Type	Field and Description
`ErrorManager`	`errMgr`

Constructors
Constructor and Description
`SymbolChecks(Grammar g, SymbolCollector collector)`

Methods
Modifier and Type	Method and Description
`void`	`checkActionRedefinitions(List<GrammarAST> actions)`
`void`	`checkForLabelConflict(Rule r, GrammarAST labelID)`
`void`	`checkForLabelConflicts(Collection<Rule> rules)` Make sure a label doesn't conflict with another symbol.
`void`	`checkForQualifiedRuleIssues(Grammar g, List<GrammarAST> qualifiedRuleRefs)`
`void`	`checkForRuleArgumentAndReturnValueConflicts(Rule r)`
`void`	`checkForTokenConflicts(List<GrammarAST> tokenIDRefs)`
`void`	`checkRuleArgs(Grammar g, List<GrammarAST> rulerefs)`
`void`	`process()`

public SymbolChecks(Grammar g,
            SymbolCollector collector)

public void checkActionRedefinitions(List<GrammarAST> actions)

public void checkForTokenConflicts(List<GrammarAST> tokenIDRefs)

checkForLabelConflicts
```
public void checkForLabelConflicts(Collection<Rule> rules)
```
Make sure a label doesn't conflict with another symbol. Labels must not conflict with: rules, tokens, scope names, return values, parameters, and rule-scope dynamic attributes defined in surrounding rule. Also they must have same type for repeated defs.

public void checkForLabelConflict(Rule r,
                         GrammarAST labelID)

public void checkForRuleArgumentAndReturnValueConflicts(Rule r)

public void checkRuleArgs(Grammar g,
                 List<GrammarAST> rulerefs)

public void checkForQualifiedRuleIssues(Grammar g,
                               List<GrammarAST> qualifiedRuleRefs)

Class SymbolChecks