Having multiple unnamed main reactors causes nullPointerException

[housengw]

minimal example

target C;
main reactor {}
main reactor {}

output

Generating code for: file: ...
******** mode: STANDALONE
******** source file: ...
******** generated sources: ...
******** generated binaries: ...
******** Using 1 threads.
lfc: fatal error: An unexpected error occurred:
java.lang.NullPointerException
	at org.lflang.generator.c.CGenerator.selfStructType(CGenerator.java:5419)
	at org.lflang.generator.c.CGenerator.generateSelfStruct(CGenerator.java:2554)
	at org.lflang.generator.c.CGenerator.generateReactorFederated(CGenerator.java:2185)
	at org.lflang.generator.c.CGenerator.generateReactorDefinitionsForFederate(CGenerator.java:1333)
	at org.lflang.generator.c.CGenerator.doGenerate(CGenerator.java:774)
	at org.lflang.generator.LFGenerator.doGenerate(LFGenerator.java:163)
	at org.eclipse.xtext.generator.GeneratorDelegate.doGenerate(GeneratorDelegate.java:44)
	at org.eclipse.xtext.generator.GeneratorDelegate.generate(GeneratorDelegate.java:35)
	at org.lflang.lfc.Main.runGenerator(Main.java:278)
	at org.lflang.lfc.Main.main(Main.java:207)

Having multiple unnamed federated reactor does not cause this issue.

[housengw]

the problem seems to be local to my laptop

[lhstrh]

The duplicate reactor check doesn't work on anonymous main reactors. The above example should trigger an error, which it currently doesn't.

[edwardalee]

Fixed by PR #965.