[INFO] crate generator_ext 0.1.2 is already in cache [INFO] extracting crate generator_ext 0.1.2 into work/ex/pr-58592/sources/master#f66e4697ae286985ddefc53c3a047614568458bb/reg/generator_ext/0.1.2 [INFO] extracting crate generator_ext 0.1.2 into work/ex/pr-58592/sources/try#c3b22200e6f5b70eb1f99ae6944d989ae17a458a/reg/generator_ext/0.1.2 [INFO] validating manifest of generator_ext-0.1.2 on toolchain master#f66e4697ae286985ddefc53c3a047614568458bb [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+f66e4697ae286985ddefc53c3a047614568458bb-alt" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] validating manifest of generator_ext-0.1.2 on toolchain try#c3b22200e6f5b70eb1f99ae6944d989ae17a458a [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c3b22200e6f5b70eb1f99ae6944d989ae17a458a-alt" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] started frobbing generator_ext-0.1.2 [INFO] finished frobbing generator_ext-0.1.2 [INFO] frobbed toml for generator_ext-0.1.2 written to work/ex/pr-58592/sources/master#f66e4697ae286985ddefc53c3a047614568458bb/reg/generator_ext/0.1.2/Cargo.toml [INFO] started frobbing generator_ext-0.1.2 [INFO] finished frobbing generator_ext-0.1.2 [INFO] frobbed toml for generator_ext-0.1.2 written to work/ex/pr-58592/sources/try#c3b22200e6f5b70eb1f99ae6944d989ae17a458a/reg/generator_ext/0.1.2/Cargo.toml [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+f66e4697ae286985ddefc53c3a047614568458bb-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"` [INFO] [stderr] error: failed to select a version for the requirement `futures = "^0.2.1"` [INFO] [stderr] candidate versions found which didn't match: 0.1.25, 0.1.24, 0.1.23, ... [INFO] [stderr] location searched: crates.io index [INFO] [stderr] required by package `generator_ext v0.1.2 (/mnt/big/crater/work/ex/pr-58592/sources/master#f66e4697ae286985ddefc53c3a047614568458bb/reg/generator_ext/0.1.2)` [ERROR] this task or one of its parent failed! [ERROR] command `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+f66e4697ae286985ddefc53c3a047614568458bb-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"` failed