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And update the java `ClassFileParser` to create distinguished
`StubClassSymbol`s, rather that a regular `ClassSymbol`s, when
encountering a deficient classpath. This brings it into line
with `Unpickler`, which has done as much since a55788e275f.
This stops the enclosed test case from crashing when determining
if the absent symbol, `A_1`, is a subclass of `@deprecated`.
This is ostensibly fixes a regression, although it only worked in
`2.10.[0-3]` by a fluke: the class file parser's promiscious
exception handling caught and recovered from the NPE introduced
in SI-7439!
% javac -d /tmp test/files/run/t8442/{A,B}_1.java && qbin/scalac -classpath /tmp -d /tmp test/files/run/t8442/C_2.scala && (rm /tmp/A_1.class; true) && scalac-hash v2.10.0 -classpath /tmp -d /tmp test/files/run/t8442/C_2.scala
warning: Class A_1 not found - continuing with a stub.
warning: Caught: java.lang.NullPointerException while parsing annotations in /tmp/B_1.class
two warnings found
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