[INFO] crate gluon_check 0.11.2 is already in cache
[INFO] extracting crate gluon_check 0.11.2 into work/ex/pr-61874/sources/master#9f06855064ed06a50c496577b21ca50f92a2e67d/reg/gluon_check/0.11.2
[INFO] extracting crate gluon_check 0.11.2 into work/ex/pr-61874/sources/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df/reg/gluon_check/0.11.2
[INFO] validating manifest of gluon_check-0.11.2 on toolchain master#9f06855064ed06a50c496577b21ca50f92a2e67d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+9f06855064ed06a50c496577b21ca50f92a2e67d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of gluon_check-0.11.2 on toolchain try#d3301713b54af69ca9de941a8c6b0d8287dbd6df
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d3301713b54af69ca9de941a8c6b0d8287dbd6df-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing gluon_check-0.11.2
[INFO] finished frobbing gluon_check-0.11.2
[INFO] frobbed toml for gluon_check-0.11.2 written to work/ex/pr-61874/sources/master#9f06855064ed06a50c496577b21ca50f92a2e67d/reg/gluon_check/0.11.2/Cargo.toml
[INFO] started frobbing gluon_check-0.11.2
[INFO] finished frobbing gluon_check-0.11.2
[INFO] frobbed toml for gluon_check-0.11.2 written to work/ex/pr-61874/sources/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df/reg/gluon_check/0.11.2/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+9f06855064ed06a50c496577b21ca50f92a2e67d-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d3301713b54af69ca9de941a8c6b0d8287dbd6df-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+9f06855064ed06a50c496577b21ca50f92a2e67d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+d3301713b54af69ca9de941a8c6b0d8287dbd6df-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] checking gluon_check-0.11.2 against try#d3301713b54af69ca9de941a8c6b0d8287dbd6df for pr-61874
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61874/worker-1/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61874/sources/try#d3301713b54af69ca9de941a8c6b0d8287dbd6df/reg/gluon_check/0.11.2:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+d3301713b54af69ca9de941a8c6b0d8287dbd6df-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] f5d96def13739c00f491522caa5eb519a157cd79f592eebfd70e17661c2fdc3d
[INFO] running `"docker" "start" "-a" "f5d96def13739c00f491522caa5eb519a157cd79f592eebfd70e17661c2fdc3d"`
[INFO] [stderr]    Compiling gluon_parser v0.11.2
[INFO] [stderr]     Checking gluon_format v0.11.2
[INFO] [stderr]     Checking gluon_check v0.11.2 (/opt/crater/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/kindcheck.rs:27:16
[INFO] [stderr]    |
[INFO] [stderr] 27 |     info: &'a (TypeEnv<Type = RcType> + 'a),
[INFO] [stderr]    |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn TypeEnv<Type = RcType> + 'a`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/kindcheck.rs:28:22
[INFO] [stderr]    |
[INFO] [stderr] 28 |     idents: &'a mut (ast::IdentEnv<Ident = Symbol> + 'a),
[INFO] [stderr]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn ast::IdentEnv<Ident = Symbol> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/kindcheck.rs:67:20
[INFO] [stderr]    |
[INFO] [stderr] 67 |         info: &'a (TypeEnv<Type = RcType> + 'a),
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn TypeEnv<Type = RcType> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/kindcheck.rs:68:26
[INFO] [stderr]    |
[INFO] [stderr] 68 |         idents: &'a mut (ast::IdentEnv<Ident = Symbol> + 'a),
[INFO] [stderr]    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn ast::IdentEnv<Ident = Symbol> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/metadata.rs:13:14
[INFO] [stderr]    |
[INFO] [stderr] 13 |     env: &'b MetadataEnv,
[INFO] [stderr]    |              ^^^^^^^^^^^ help: use `dyn`: `dyn MetadataEnv`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/metadata.rs:122:11
[INFO] [stderr]     |
[INFO] [stderr] 122 |     env: &MetadataEnv,
[INFO] [stderr]     |           ^^^^^^^^^^^ help: use `dyn`: `dyn MetadataEnv`
[INFO] [stderr] 
[INFO] [stderr] warning: the item `Arena` is imported redundantly
[INFO] [stderr]   --> src/typecheck/error.rs:91:22
[INFO] [stderr]    |
[INFO] [stderr] 5  | use pretty::Arena;
[INFO] [stderr]    |     ------------- the item `Arena` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 91 |         use pretty::{Arena, DocAllocator};
[INFO] [stderr]    |                      ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/typecheck/generalize.rs:82:20
[INFO] [stderr]    |
[INFO] [stderr] 82 |         args: &mut Iterator<Item = &'i mut SpannedIdent<Symbol>>,
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = &'i mut SpannedIdent<Symbol>>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/typecheck.rs:61:23
[INFO] [stderr]    |
[INFO] [stderr] 61 |     environment: &'a (TypecheckEnv<Type = RcType> + 'a),
[INFO] [stderr]    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn TypecheckEnv<Type = RcType> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/typecheck.rs:152:27
[INFO] [stderr]     |
[INFO] [stderr] 152 |         environment: &'a (TypecheckEnv<Type = ArcType> + 'a),
[INFO] [stderr]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn TypecheckEnv<Type = ArcType> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/typecheck.rs:357:20
[INFO] [stderr]     |
[INFO] [stderr] 357 |         args: &mut Iterator<Item = &'i mut SpannedIdent<Symbol>>,
[INFO] [stderr]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = &'i mut SpannedIdent<Symbol>>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]     --> src/typecheck.rs:1251:20
[INFO] [stderr]      |
[INFO] [stderr] 1251 |         args: &mut ExactSizeIterator<Item = &'e mut SpannedExpr<Symbol>>,
[INFO] [stderr]      |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn ExactSizeIterator<Item = &'e mut SpannedExpr<Symbol>>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]     --> src/typecheck.rs:2404:24
[INFO] [stderr]      |
[INFO] [stderr] 2404 |         receiver: &mut FnMut(Expr<Symbol>),
[INFO] [stderr]      |                        ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn FnMut(Expr<Symbol>)`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]     --> src/typecheck.rs:2839:11
[INFO] [stderr]      |
[INFO] [stderr] 2839 |     env: &TypeEnv<Type = RcType>,
[INFO] [stderr]      |           ^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn TypeEnv<Type = RcType>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]     --> src/typecheck.rs:2840:19
[INFO] [stderr]      |
[INFO] [stderr] 2840 |     symbols: &mut IdentEnv<Ident = Symbol>,
[INFO] [stderr]      |                   ^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn IdentEnv<Ident = Symbol>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]     --> src/typecheck.rs:2922:14
[INFO] [stderr]      |
[INFO] [stderr] 2922 |     env: &'a TypeEnv<Type = RcType>,
[INFO] [stderr]      |              ^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn TypeEnv<Type = RcType>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/unify_type.rs:41:15
[INFO] [stderr]    |
[INFO] [stderr] 41 |     env: &'a (TypeEnv<Type = RcType> + 'a),
[INFO] [stderr]    |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn TypeEnv<Type = RcType> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/unify_type.rs:52:19
[INFO] [stderr]    |
[INFO] [stderr] 52 |         env: &'a (TypeEnv<Type = RcType> + 'a),
[INFO] [stderr]    |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn TypeEnv<Type = RcType> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/unify_type.rs:128:72
[INFO] [stderr]     |
[INFO] [stderr] 128 | pub fn similarity_filter<'a, I, T>(typ: &'a T, fields: &'a [I]) -> Box<Fn(&I) -> Filter + 'a>
[INFO] [stderr]     |                                                                        ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(&I) -> Filter + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/unify_type.rs:171:45
[INFO] [stderr]     |
[INFO] [stderr] 171 |     pub fn make_filter<'a>(&'a self) -> Box<Fn(&I) -> Filter + 'a> {
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(&I) -> Filter + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/unify_type.rs:188:39
[INFO] [stderr]     |
[INFO] [stderr] 188 |     pub fn filter_fmt(&self, filter: &Fn(&I) -> Filter, f: &mut fmt::Formatter) -> fmt::Result {
[INFO] [stderr]     |                                       ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(&I) -> Filter`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]     --> src/unify_type.rs:1108:20
[INFO] [stderr]      |
[INFO] [stderr] 1108 |     receiver: &mut FnMut(&RcType),
[INFO] [stderr]      |                    ^^^^^^^^^^^^^^ help: use `dyn`: `dyn FnMut(&RcType)`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]     --> src/unify_type.rs:1162:24
[INFO] [stderr]      |
[INFO] [stderr] 1162 |         receiver: &mut FnMut(&RcType),
[INFO] [stderr]      |                        ^^^^^^^^^^^^^^ help: use `dyn`: `dyn FnMut(&RcType)`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/implicits.rs:211:45
[INFO] [stderr]     |
[INFO] [stderr] 211 |                         Box::new(bs) as Box<DoubleEndedIterator<Item = _>>
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn DoubleEndedIterator<Item = _>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/implicits.rs:724:22
[INFO] [stderr]     |
[INFO] [stderr] 724 |     environment: &'a TypecheckEnv<Type = RcType>,
[INFO] [stderr]     |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn TypecheckEnv<Type = RcType>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/implicits.rs:732:26
[INFO] [stderr]     |
[INFO] [stderr] 732 |         environment: &'a TypecheckEnv<Type = RcType>,
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn TypecheckEnv<Type = RcType>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/lib.rs:53:11
[INFO] [stderr]    |
[INFO] [stderr] 53 |     env: &TypecheckEnv<Type = ArcType>,
[INFO] [stderr]    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn TypecheckEnv<Type = ArcType>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/lib.rs:64:11
[INFO] [stderr]    |
[INFO] [stderr] 64 |     env: &TypeEnv<Type = RcType>,
[INFO] [stderr]    |           ^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn TypeEnv<Type = RcType>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/kindcheck.rs:27:16
[INFO] [stderr]    |
[INFO] [stderr] 27 |     info: &'a (TypeEnv<Type = RcType> + 'a),
[INFO] [stderr]    |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn TypeEnv<Type = RcType> + 'a`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/kindcheck.rs:28:22
[INFO] [stderr]    |
[INFO] [stderr] 28 |     idents: &'a mut (ast::IdentEnv<Ident = Symbol> + 'a),
[INFO] [stderr]    |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn ast::IdentEnv<Ident = Symbol> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/kindcheck.rs:67:20
[INFO] [stderr]    |
[INFO] [stderr] 67 |         info: &'a (TypeEnv<Type = RcType> + 'a),
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn TypeEnv<Type = RcType> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/kindcheck.rs:68:26
[INFO] [stderr]    |
[INFO] [stderr] 68 |         idents: &'a mut (ast::IdentEnv<Ident = Symbol> + 'a),
[INFO] [stderr]    |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn ast::IdentEnv<Ident = Symbol> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/metadata.rs:13:14
[INFO] [stderr]    |
[INFO] [stderr] 13 |     env: &'b MetadataEnv,
[INFO] [stderr]    |              ^^^^^^^^^^^ help: use `dyn`: `dyn MetadataEnv`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/metadata.rs:122:11
[INFO] [stderr]     |
[INFO] [stderr] 122 |     env: &MetadataEnv,
[INFO] [stderr]     |           ^^^^^^^^^^^ help: use `dyn`: `dyn MetadataEnv`
[INFO] [stderr] 
[INFO] [stderr] warning: the item `Arena` is imported redundantly
[INFO] [stderr]   --> src/typecheck/error.rs:91:22
[INFO] [stderr]    |
[INFO] [stderr] 5  | use pretty::Arena;
[INFO] [stderr]    |     ------------- the item `Arena` is already imported here
[INFO] [stderr] ...
[INFO] [stderr] 91 |         use pretty::{Arena, DocAllocator};
[INFO] [stderr]    |                      ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/typecheck/generalize.rs:82:20
[INFO] [stderr]    |
[INFO] [stderr] 82 |         args: &mut Iterator<Item = &'i mut SpannedIdent<Symbol>>,
[INFO] [stderr]    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = &'i mut SpannedIdent<Symbol>>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/typecheck.rs:61:23
[INFO] [stderr]    |
[INFO] [stderr] 61 |     environment: &'a (TypecheckEnv<Type = RcType> + 'a),
[INFO] [stderr]    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn TypecheckEnv<Type = RcType> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/typecheck.rs:152:27
[INFO] [stderr]     |
[INFO] [stderr] 152 |         environment: &'a (TypecheckEnv<Type = ArcType> + 'a),
[INFO] [stderr]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn TypecheckEnv<Type = ArcType> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/typecheck.rs:357:20
[INFO] [stderr]     |
[INFO] [stderr] 357 |         args: &mut Iterator<Item = &'i mut SpannedIdent<Symbol>>,
[INFO] [stderr]     |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = &'i mut SpannedIdent<Symbol>>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]     --> src/typecheck.rs:1251:20
[INFO] [stderr]      |
[INFO] [stderr] 1251 |         args: &mut ExactSizeIterator<Item = &'e mut SpannedExpr<Symbol>>,
[INFO] [stderr]      |                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn ExactSizeIterator<Item = &'e mut SpannedExpr<Symbol>>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]     --> src/typecheck.rs:2404:24
[INFO] [stderr]      |
[INFO] [stderr] 2404 |         receiver: &mut FnMut(Expr<Symbol>),
[INFO] [stderr]      |                        ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn FnMut(Expr<Symbol>)`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]     --> src/typecheck.rs:2839:11
[INFO] [stderr]      |
[INFO] [stderr] 2839 |     env: &TypeEnv<Type = RcType>,
[INFO] [stderr]      |           ^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn TypeEnv<Type = RcType>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]     --> src/typecheck.rs:2840:19
[INFO] [stderr]      |
[INFO] [stderr] 2840 |     symbols: &mut IdentEnv<Ident = Symbol>,
[INFO] [stderr]      |                   ^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn IdentEnv<Ident = Symbol>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]     --> src/typecheck.rs:2922:14
[INFO] [stderr]      |
[INFO] [stderr] 2922 |     env: &'a TypeEnv<Type = RcType>,
[INFO] [stderr]      |              ^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn TypeEnv<Type = RcType>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/unify.rs:304:54
[INFO] [stderr]     |
[INFO] [stderr] 304 |             fn traverse_<'t>(typ: &'t TType, f: &mut Walker<'t, TType>) {
[INFO] [stderr]     |                                                      ^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Walker<'t, TType>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/unify_type.rs:41:15
[INFO] [stderr]    |
[INFO] [stderr] 41 |     env: &'a (TypeEnv<Type = RcType> + 'a),
[INFO] [stderr]    |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn TypeEnv<Type = RcType> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/unify_type.rs:52:19
[INFO] [stderr]    |
[INFO] [stderr] 52 |         env: &'a (TypeEnv<Type = RcType> + 'a),
[INFO] [stderr]    |                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn TypeEnv<Type = RcType> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/unify_type.rs:128:72
[INFO] [stderr]     |
[INFO] [stderr] 128 | pub fn similarity_filter<'a, I, T>(typ: &'a T, fields: &'a [I]) -> Box<Fn(&I) -> Filter + 'a>
[INFO] [stderr]     |                                                                        ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(&I) -> Filter + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/unify_type.rs:171:45
[INFO] [stderr]     |
[INFO] [stderr] 171 |     pub fn make_filter<'a>(&'a self) -> Box<Fn(&I) -> Filter + 'a> {
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(&I) -> Filter + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/unify_type.rs:188:39
[INFO] [stderr]     |
[INFO] [stderr] 188 |     pub fn filter_fmt(&self, filter: &Fn(&I) -> Filter, f: &mut fmt::Formatter) -> fmt::Result {
[INFO] [stderr]     |                                       ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(&I) -> Filter`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]     --> src/unify_type.rs:1108:20
[INFO] [stderr]      |
[INFO] [stderr] 1108 |     receiver: &mut FnMut(&RcType),
[INFO] [stderr]      |                    ^^^^^^^^^^^^^^ help: use `dyn`: `dyn FnMut(&RcType)`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]     --> src/unify_type.rs:1162:24
[INFO] [stderr]      |
[INFO] [stderr] 1162 |         receiver: &mut FnMut(&RcType),
[INFO] [stderr]      |                        ^^^^^^^^^^^^^^ help: use `dyn`: `dyn FnMut(&RcType)`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/implicits.rs:211:45
[INFO] [stderr]     |
[INFO] [stderr] 211 |                         Box::new(bs) as Box<DoubleEndedIterator<Item = _>>
[INFO] [stderr]     |                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn DoubleEndedIterator<Item = _>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/implicits.rs:724:22
[INFO] [stderr]     |
[INFO] [stderr] 724 |     environment: &'a TypecheckEnv<Type = RcType>,
[INFO] [stderr]     |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn TypecheckEnv<Type = RcType>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/implicits.rs:732:26
[INFO] [stderr]     |
[INFO] [stderr] 732 |         environment: &'a TypecheckEnv<Type = RcType>,
[INFO] [stderr]     |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn TypecheckEnv<Type = RcType>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/lib.rs:53:11
[INFO] [stderr]    |
[INFO] [stderr] 53 |     env: &TypecheckEnv<Type = ArcType>,
[INFO] [stderr]    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn TypecheckEnv<Type = ArcType>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/lib.rs:64:11
[INFO] [stderr]    |
[INFO] [stderr] 64 |     env: &TypeEnv<Type = RcType>,
[INFO] [stderr]    |           ^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn TypeEnv<Type = RcType>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> tests/metadata.rs:19:19
[INFO] [stderr]    |
[INFO] [stderr] 19 | fn metadata(env: &MetadataEnv, expr: &mut SpannedExpr<Symbol>) -> Metadata {
[INFO] [stderr]    |                   ^^^^^^^^^^^ help: use `dyn`: `dyn MetadataEnv`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(bare_trait_objects)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 56.82s
[INFO] running `"docker" "inspect" "f5d96def13739c00f491522caa5eb519a157cd79f592eebfd70e17661c2fdc3d"`
[INFO] running `"docker" "rm" "-f" "f5d96def13739c00f491522caa5eb519a157cd79f592eebfd70e17661c2fdc3d"`
[INFO] [stdout] f5d96def13739c00f491522caa5eb519a157cd79f592eebfd70e17661c2fdc3d