minor: fix mismatch of struct/class forward decl of 'Source' #3179
+1
−1
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Fixes the following warning and the indicate potential issue:
src/libstore/worker-protocol.hh:66:1: warning: class 'Source' was previously declared as a struct; this is valid, but may result in linker errors
under the Microsoft C++ ABI [-Wmismatched-tags]
(cherry picked from commit 6e1bb04870b1b723282d32182af286646f13bf3c)