src/main/java/org/apache/maven/plugin/compiler/AbstractCompilerMojo.java (5 lines):
	- line 97: * TODO: At least one step could be optimized, currently the plugin will do two
	- line 676: // TODO somehow shaky dependency between compilerId and tool executable.
	- line 926: // TODO: This second scan for source files is sub-optimal
	- line 1163: // TODO: don't catch Exception
	- line 1420: // TODO remove the part with ToolchainManager lookup once we depend on