Tracer (morel 0.3.0 API)

All Known Implementing Classes:

Tracers.DelegatingTracer, Tracers.EmptyTracer
```
public interface Tracer
```
Called on various events during compilation.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`handleCompileException(@Nullable CompileException e)`	Called with the exception thrown during validation, or null if no exception was thrown.
`void`	`onCore(int pass, Core.Decl e)`	Called when the expression is converted to core.
`boolean`	`onException(@Nullable Throwable e)`	Called with the exception thrown during evaluation, or null if no exception was thrown.
`void`	`onPlan(Code code)`	Called when code is generated.
`void`	`onResult(Object o)`	Called on the result of an evaluation.
`boolean`	`onTypeException(TypeResolver.TypeException e)`	Called with the exception thrown during type resolution.
`void`	`onWarnings(List<Throwable> warningList)`	Called with the list of warnings after evaluation.

- Method Detail
  - onCore
```
void onCore(int pass,
            Core.Decl e)
```
    Called when the expression is converted to core.
  - onPlan
```
void onPlan(Code code)
```
    Called when code is generated.
  - onResult
```
void onResult(Object o)
```
    Called on the result of an evaluation.
  - onWarnings
```
void onWarnings(List<Throwable> warningList)
```
    Called with the list of warnings after evaluation.
  - onException
```
boolean onException(@Nullable Throwable e)
```
    Called with the exception thrown during evaluation, or null if no exception was thrown. Returns whether a handler was found.
  - onTypeException
```
boolean onTypeException(TypeResolver.TypeException e)
```
    Called with the exception thrown during type resolution. Returns whether a handler was found.
  - handleCompileException
```
boolean handleCompileException(@Nullable CompileException e)
```
    Called with the exception thrown during validation, or null if no exception was thrown. Returns whether a handler was found.