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The RUNFILES environment variable is an implementation detail of the internal build rule, while TEST_SRCDIR is set by bazel. In practice, they are pointed to the same directory. See go/lsc-dart-runfiles for context. R=srawlins@google.com Change-Id: I2f7ea1aef7ff4ce2209d001eb89054e86abf22d2 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/344342 Reviewed-by: Samuel Rawlins <srawlins@google.com> Auto-Submit: Chingjun Lau <chingjun@google.com> Commit-Queue: Samuel Rawlins <srawlins@google.com>