Merge branch 'semantic/invalid-array-index' into 'master'

Add test case for illegal assignment in array index

See merge request !59
6 jobs for master in 20 minutes and 47 seconds (queued for 1 second)
Name Stage Failure
failed
gruppen: [4, iComputerfreak/DerCompiler, 1] Run
Ran 43 tests, of which 1 failed.
A full report for each test can be found at ../../../mjtest/reports/26-01-22_19-39-59_compile.failed
Ran 594 tests, of which 8 failed.



Editing issue 5
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1

failed
gruppen: [3, larsk21/compiler-minijava, 1] Run
[ERROR] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1

failed
gruppen: [2, compilerpraktikum/compiler, 1] Run
Ran 43 tests, of which 43 failed.
A full report for each test can be found at ../../../mjtest/reports/26-01-22_19-33-24_compile.failed
Ran 594 tests, of which 111 failed.



Editing issue 63
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1