{ "binary":
  { "doc": ["A Rust binary."]
  , "string_fields": ["name", "edition", "stage", "version", "pkg_name"]
  , "target_fields":
    ["crate_root", "srcs", "deps", "cargo_features", "build_script"]
  , "field_doc":
    { "name": ["The name of the crate being built."]
    , "build_script":
      [ "The \"build_script\" target required to be built and run before"
      , "compiling this binary."
      ]
    , "cargo_features":
      ["List of cargo features this binary requires to be enabled."]
    , "crate_root":
      [ "The crate to be fed to the Rust compiler. It must evaluate to"
      , "a single artifact/file."
      ]
    , "defaults": ["The Rust toolchain to use."]
    , "deps": ["Any other libraries this binary depends upon."]
    , "edition":
      [ "The edition of the compiler to use during compilation. If"
      , "unset, 2015 is used."
      ]
    , "pkg_name":
      [ "The name of the package the crate belongs to. It is"
      , "exported to the CARGO_PKG_NAME environment variable."
      ]
    , "srcs": ["The source files of the binary."]
    , "stage":
      [ "The logical location of the resulting artifact. Elements are"
      , "joined with \"/\"."
      ]
    , "version":
      [ "The crate version. Elements are joined with \".\" and the first"
      , "three elements are used for the major, minor, and patch"
      , "number respectively."
      ]
    }
  , "config_vars": ["ENV"]
  , "config_doc":
    { "ENV":
      [ "Additional environment variables (besides ones provided by"
      , "the \"defaults\" target) to be set for each action. If the"
      , "same variable is set here and in the \"defaults\", the former"
      , "is taken."
      ]
    }
  , "config_transitions":
    { "build_script": [{"type": "CALL_EXPRESSION", "name": "to rlib"}]
    , "cargo_features": [{"type": "CALL_EXPRESSION", "name": "to rlib"}]
    , "deps": [{"type": "CALL_EXPRESSION", "name": "to rlib"}]
    }
  , "imports": {"call rustc": "call rustc result", "to rlib": "to rlib"}
  , "implicit": {"defaults": ["defaults"]}
  , "expression":
    { "type": "let*"
    , "bindings":
      [ ["crate_name", {"type": "FIELD", "name": "name"}]
      , ["crate_type", "bin"]
      , ["deps-transition", {"type": "CALL_EXPRESSION", "name": "to rlib"}]
      , [ "stage"
        , { "type": "if"
          , "cond": {"type": "FIELD", "name": "stage"}
          , "then":
            { "type": "join"
            , "$1": {"type": "FIELD", "name": "stage"}
            , "separator": "/"
            }
          , "else": "."
          }
        ]
      , ["crate_root", {"type": "FIELD", "name": "crate_root"}]
      , ["edition", {"type": "FIELD", "name": "edition"}]
      , ["srcs", {"type": "FIELD", "name": "srcs"}]
      , ["deps", {"type": "FIELD", "name": "deps"}]
      , ["build_script", {"type": "FIELD", "name": "build_script"}]
      , ["cargo_features", {"type": "FIELD", "name": "cargo_features"}]
      , ["version", {"type": "FIELD", "name": "version"}]
      , ["pkg_name", {"type": "FIELD", "name": "pkg_name"}]
      , ["defaults", {"type": "FIELD", "name": "defaults"}]
      ]
    , "body": {"type": "CALL_EXPRESSION", "name": "call rustc"}
    }
  }
, "defaults":
  { "doc":
    [ "A rule to provide defaults."
    , "All rust targets take their defaults for RUSTC, TARGET, compile"
    , "flags etc."
    ]
  , "string_fields":
    [ "ADD_RUSTC_FLAGS"
    , "HOST"
    , "LINKER"
    , "PATH"
    , "RUSTC"
    , "RUSTC_FLAGS"
    , "TARGET"
    , "CARGO_CFG_TARGET_ARCH"
    , "CARGO_CFG_TARGET_ENDIAN"
    , "CARGO_CFG_TARGET_ENV"
    , "CARGO_CFG_TARGET_FAMILY"
    , "CARGO_CFG_TARGET_FEATURE"
    , "CARGO_CFG_TARGET_HAS_ATOMIC"
    , "CARGO_CFG_TARGET_OS"
    , "CARGO_CFG_TARGET_POINTER_WIDTH"
    , "CARGO_CFG_TARGET_VENDOR"
    , "CARGO_CFG_UNIX"
    , "CARGO_CFG_WINDOWS"
    ]
  , "target_fields": ["base"]
  , "field_doc":
    { "ADD_RUSTC_FLAGS":
      [ "Additional flags for rustc. The values are appended to the ones"
      , "from \"base\"."
      ]
    , "CARGO_CFG_TARGET_ARCH":
      [ "The CPU target architecture. It overwrites the value from"
      , "\"base\"."
      ]
    , "CARGO_CFG_TARGET_ENDIAN":
      ["The CPU target endianness. It overwrites the value from \"base\"."]
    , "CARGO_CFG_TARGET_ENV":
      ["The target environment ABI. It overwrites the value from", "\"base\"."]
    , "CARGO_CFG_TARGET_FAMILY":
      ["The target family. It overwrites the value from \"base\"."]
    , "CARGO_CFG_TARGET_FEATURE":
      [ "List of CPU target features enabled. Elements are joined with"
      , "\",\". It overwrites the value from \"base\"."
      ]
    , "CARGO_CFG_TARGET_HAS_ATOMIC":
      [ "List of atomics types (in bits) supported by the target"
      , "CPU. Elements are joined with \",\". It overwrites the value from"
      , "\"base\"."
      ]
    , "CARGO_CFG_TARGET_OS":
      [ "The target operating system. It overwrites the value from"
      , "\"base\"."
      ]
    , "CARGO_CFG_TARGET_POINTER_WIDTH":
      ["The CPU pointer width. It overwrites the value from \"base\"."]
    , "CARGO_CFG_TARGET_VENDOR":
      ["The target vendor. It overwrites the value from \"base\"."]
    , "CARGO_CFG_UNIX":
      [ "To be set on unix-like platforms. It overwrites the value from"
      , "\"base\"."
      ]
    , "CARGO_CFG_WINDOWS":
      [ "To be set on windows-like platforms. It overwrites the value"
      , "from \"base\"."
      ]
    , "HOST":
      [ "The host triple of the Rust compiler (e.g.,"
      , "\"x86_64-unknown-linux-gnu\"). It overwrites the value from"
      , "\"base\"."
      ]
    , "LINKER":
      [ "The value to pass to the \"--linker\" rustc flag. It overwrites"
      , "the value from \"base\"."
      ]
    , "PATH":
      [ "Environment variable for looking up compilers and"
      , "linkers. Elements are joined with \":\". The values are put in"
      , "front of the ones from \"base\"."
      ]
    , "RUSTC":
      ["The Rust compiler to use. It overwrites the value from \"base\"."]
    , "RUSTC_FLAGS":
      ["The rustc flags to use. It overwrites the value from \"base\"."]
    , "TARGET":
      [ "The target triple for which the code is compiled (e.g.,"
      , "\"x86_64-unknown-linux-gnu\"). It overwrites the value from"
      , "\"base\"."
      ]
    , "base":
      [ "Other targets of the very same type to inherit values from. If"
      , "the same field is defined both targets, depending on the field,"
      , "the value from \"base\" is extended or overwritten."
      ]
    }
  , "config_vars": ["ARCH", "HOST_ARCH", "TARGET_ARCH"]
  , "config_doc":
    { "ARCH":
      [ "Default value for both HOST_ARCH and TARGET_ARCH. It is user's"
      , "responsibility to adapt the \"defaults\" according to the"
      , "provided value."
      ]
    , "HOST_ARCH":
      [ "The host CPU architecture. It is user's responsibility to"
      , "adapt the \"defaults\" according to the provided value."
      ]
    , "TARGET_ARCH":
      [ "The target CPU architecture. It is user's responsibility to"
      , "adapt the \"defaults\" according to the provided value."
      ]
    }
  , "imports":
    { "default_from_base": ["./", "..", "default_from_base"]
    , "flatten_from_provides": ["./", "..", "flatten_from_provides"]
    }
  , "expression":
    { "type": "let*"
    , "bindings":
      [ ["base", {"type": "FIELD", "name": "base"}]
      , [ "ADD_RUSTC_FLAGS"
        , { "type": "++"
          , "$1":
            [ { "type": "let*"
              , "bindings": [["key", "ADD_RUSTC_FLAGS"]]
              , "body":
                {"type": "CALL_EXPRESSION", "name": "default_from_base"}
              }
            , {"type": "FIELD", "name": "ADD_RUSTC_FLAGS"}
            ]
          }
        ]
      , [ "HOST"
        , { "type": "let*"
          , "bindings":
            [["key", "HOST"], ["value", {"type": "FIELD", "name": "HOST"}]]
          , "body": {"type": "CALL_EXPRESSION", "name": "default_from_base"}
          }
        ]
      , [ "LINKER"
        , { "type": "let*"
          , "bindings":
            [["key", "LINKER"], ["value", {"type": "FIELD", "name": "LINKER"}]]
          , "body": {"type": "CALL_EXPRESSION", "name": "default_from_base"}
          }
        ]
      , [ "PATH"
        , { "type": "++"
          , "$1":
            [ {"type": "FIELD", "name": "PATH"}
            , { "type": "let*"
              , "bindings": [["key", "PATH"]]
              , "body":
                {"type": "CALL_EXPRESSION", "name": "default_from_base"}
              }
            ]
          }
        ]
      , [ "RUSTC"
        , { "type": "let*"
          , "bindings":
            [["key", "RUSTC"], ["value", {"type": "FIELD", "name": "RUSTC"}]]
          , "body": {"type": "CALL_EXPRESSION", "name": "default_from_base"}
          }
        ]
      , [ "RUSTC_FLAGS"
        , { "type": "let*"
          , "bindings":
            [ ["key", "RUSTC_FLAGS"]
            , ["value", {"type": "FIELD", "name": "RUSTC_FLAGS"}]
            ]
          , "body": {"type": "CALL_EXPRESSION", "name": "default_from_base"}
          }
        ]
      , [ "TARGET"
        , { "type": "let*"
          , "bindings":
            [["key", "TARGET"], ["value", {"type": "FIELD", "name": "TARGET"}]]
          , "body": {"type": "CALL_EXPRESSION", "name": "default_from_base"}
          }
        ]
      , [ "CARGO_CFG_TARGET_ARCH"
        , { "type": "let*"
          , "bindings":
            [ ["key", "CARGO_CFG_TARGET_ARCH"]
            , ["value", {"type": "FIELD", "name": "CARGO_CFG_TARGET_ARCH"}]
            ]
          , "body": {"type": "CALL_EXPRESSION", "name": "default_from_base"}
          }
        ]
      , [ "CARGO_CFG_TARGET_ENDIAN"
        , { "type": "let*"
          , "bindings":
            [ ["key", "CARGO_CFG_TARGET_ENDIAN"]
            , ["value", {"type": "FIELD", "name": "CARGO_CFG_TARGET_ENDIAN"}]
            ]
          , "body": {"type": "CALL_EXPRESSION", "name": "default_from_base"}
          }
        ]
      , [ "CARGO_CFG_TARGET_ENV"
        , { "type": "let*"
          , "bindings":
            [ ["key", "CARGO_CFG_TARGET_ENV"]
            , ["value", {"type": "FIELD", "name": "CARGO_CFG_TARGET_ENV"}]
            ]
          , "body": {"type": "CALL_EXPRESSION", "name": "default_from_base"}
          }
        ]
      , [ "CARGO_CFG_TARGET_FAMILY"
        , { "type": "let*"
          , "bindings":
            [ ["key", "CARGO_CFG_TARGET_FAMILY"]
            , ["value", {"type": "FIELD", "name": "CARGO_CFG_TARGET_FAMILY"}]
            ]
          , "body": {"type": "CALL_EXPRESSION", "name": "default_from_base"}
          }
        ]
      , [ "CARGO_CFG_TARGET_FEATURE"
        , { "type": "let*"
          , "bindings":
            [ ["key", "CARGO_CFG_TARGET_FEATURE"]
            , ["value", {"type": "FIELD", "name": "CARGO_CFG_TARGET_FEATURE"}]
            ]
          , "body": {"type": "CALL_EXPRESSION", "name": "default_from_base"}
          }
        ]
      , [ "CARGO_CFG_TARGET_HAS_ATOMIC"
        , { "type": "let*"
          , "bindings":
            [ ["key", "CARGO_CFG_TARGET_HAS_ATOMIC"]
            , [ "value"
              , {"type": "FIELD", "name": "CARGO_CFG_TARGET_HAS_ATOMIC"}
              ]
            ]
          , "body": {"type": "CALL_EXPRESSION", "name": "default_from_base"}
          }
        ]
      , [ "CARGO_CFG_TARGET_OS"
        , { "type": "let*"
          , "bindings":
            [ ["key", "CARGO_CFG_TARGET_OS"]
            , ["value", {"type": "FIELD", "name": "CARGO_CFG_TARGET_OS"}]
            ]
          , "body": {"type": "CALL_EXPRESSION", "name": "default_from_base"}
          }
        ]
      , [ "CARGO_CFG_TARGET_POINTER_WIDTH"
        , { "type": "let*"
          , "bindings":
            [ ["key", "CARGO_CFG_TARGET_POINTER_WIDTH"]
            , [ "value"
              , {"type": "FIELD", "name": "CARGO_CFG_TARGET_POINTER_WIDTH"}
              ]
            ]
          , "body": {"type": "CALL_EXPRESSION", "name": "default_from_base"}
          }
        ]
      , [ "CARGO_CFG_TARGET_VENDOR"
        , { "type": "let*"
          , "bindings":
            [ ["key", "CARGO_CFG_TARGET_VENDOR"]
            , ["value", {"type": "FIELD", "name": "CARGO_CFG_TARGET_VENDOR"}]
            ]
          , "body": {"type": "CALL_EXPRESSION", "name": "default_from_base"}
          }
        ]
      , [ "CARGO_CFG_UNIX"
        , { "type": "let*"
          , "bindings":
            [ ["key", "CARGO_CFG_UNIX"]
            , ["value", {"type": "FIELD", "name": "CARGO_CFG_UNIX"}]
            ]
          , "body": {"type": "CALL_EXPRESSION", "name": "default_from_base"}
          }
        ]
      , [ "CARGO_CFG_WINDOWS"
        , { "type": "let*"
          , "bindings":
            [ ["key", "CARGO_CFG_WINDOWS"]
            , ["value", {"type": "FIELD", "name": "CARGO_CFG_WINDOWS"}]
            ]
          , "body": {"type": "CALL_EXPRESSION", "name": "default_from_base"}
          }
        ]
      ]
    , "body":
      { "type": "RESULT"
      , "provides":
        { "type": "env"
        , "vars":
          [ "ADD_RUSTC_FLAGS"
          , "HOST"
          , "LINKER"
          , "PATH"
          , "RUSTC"
          , "RUSTC_FLAGS"
          , "TARGET"
          , "CARGO_CFG_TARGET_ARCH"
          , "CARGO_CFG_TARGET_ENDIAN"
          , "CARGO_CFG_TARGET_ENV"
          , "CARGO_CFG_TARGET_FAMILY"
          , "CARGO_CFG_TARGET_FEATURE"
          , "CARGO_CFG_TARGET_HAS_ATOMIC"
          , "CARGO_CFG_TARGET_OS"
          , "CARGO_CFG_TARGET_POINTER_WIDTH"
          , "CARGO_CFG_TARGET_VENDOR"
          , "CARGO_CFG_UNIX"
          , "CARGO_CFG_WINDOWS"
          ]
        }
      }
    }
  }
, "library":
  { "doc":
    [ "A Rust library. Depending on the value of the fields \"shared\""
    , "and \"native\", the `--crate-type` is inferred as follows:"
    , ""
    , "|shared|native|crate-type|"
    , "|------|------|----------|"
    , "| null | null | rlib     |"
    , "| null |\"true\"| staticlib|"
    , "|\"true\"| null | dylib    |"
    , "|\"true\"|\"true\"| cdylib   |"
    ]
  , "string_fields":
    ["name", "edition", "stage", "version", "pkg_name", "shared", "native"]
  , "target_fields":
    ["crate_root", "srcs", "deps", "cargo_features", "build_script", "c_hdrs"]
  , "field_doc":
    { "name": ["The name of the crate being built."]
    , "build_script":
      [ "The \"build_script\" target required to be built and run before"
      , "compiling this library."
      ]
    , "c_hdrs":
      [ "C headers that define the interface to this library."
      , "This field is ignored when this library is consumed by another"
      , "Rust target."
      , ""
      , "If non empty, a native library will be produced."
      ]
    , "cargo_features":
      ["List of cargo features this library requires to be enabled."]
    , "crate_root":
      [ "The crate to be fed to the Rust compiler. It must evaluate to"
      , "a single artifact/file."
      ]
    , "defaults": ["The Rust toolchain to use."]
    , "deps": ["Any other libraries this library depends upon."]
    , "edition":
      [ "The edition of the compiler to use during compilation."
      , "If unset, 2015 is used."
      ]
    , "native":
      [ "If not null, a native library will be produced."
      , ""
      , "Note that, when this target is consumed by another Rust target,"
      , "it will be compiled to a Rust static library (.rlib)."
      ]
    , "pkg_name":
      [ "The name of the package the crate belongs to. It is"
      , "exported to the CARGO_PKG_NAME environment variable."
      ]
    , "shared": ["If not null, a shared library will be produced."]
    , "srcs": ["The source files of the library."]
    , "stage":
      [ "The logical location of the resulting artifact."
      , "Elements are joined with \"/\"."
      ]
    , "version":
      [ "The crate version. Elements are joined with \".\" and the first"
      , "three elements are used for the major, minor, and patch"
      , "number respectively."
      ]
    }
  , "config_vars": ["ENV", "RLIB"]
  , "config_doc":
    { "ENV":
      [ "Additional environment variables (besides ones provided by"
      , "the \"defaults\" target) to be set for each action. If the"
      , "same variable is set here and in the \"defaults\", the former"
      , "is taken."
      ]
    , "RLIB":
      [ "If evaluates to true, the \"shared\" and \"native\" fields are"
      , "ignored and the crate type will be set to rlib."
      ]
    }
  , "config_transitions":
    { "build_script": [{"type": "CALL_EXPRESSION", "name": "to rlib"}]
    , "cargo_features": [{"type": "CALL_EXPRESSION", "name": "to rlib"}]
    , "deps": [{"type": "CALL_EXPRESSION", "name": "to rlib"}]
    }
  , "imports":
    { "call rustc": "call rustc result"
    , "get_artifacts": ["./", "..", "get_artifacts"]
    , "to rlib": "to rlib"
    }
  , "implicit": {"defaults": ["defaults"]}
  , "expression":
    { "type": "let*"
    , "bindings":
      [ ["crate_name", {"type": "FIELD", "name": "name"}]
      , [ "native"
        , { "type": "or"
          , "$1":
            [ {"type": "FIELD", "name": "c_hdrs"}
            , {"type": "FIELD", "name": "native"}
            ]
          }
        ]
      , [ "crate_type"
        , { "type": "if"
          , "cond": {"type": "var", "name": "RLIB"}
          , "then": "rlib"
          , "else":
            { "type": "if"
            , "cond": {"type": "FIELD", "name": "shared"}
            , "then":
              { "type": "if"
              , "cond": {"type": "var", "name": "native"}
              , "then": "cdylib"
              , "else": "dylib"
              }
            , "else":
              { "type": "if"
              , "cond": {"type": "var", "name": "native"}
              , "then": "staticlib"
              , "else": "rlib"
              }
            }
          }
        ]
      , ["deps-transition", {"type": "CALL_EXPRESSION", "name": "to rlib"}]
      , [ "stage"
        , { "type": "if"
          , "cond": {"type": "FIELD", "name": "stage"}
          , "then":
            { "type": "join"
            , "$1": {"type": "FIELD", "name": "stage"}
            , "separator": "/"
            }
          , "else": "."
          }
        ]
      , [ "c_hdrs"
        , { "type": "to_subdir"
          , "subdir": {"type": "var", "name": "stage"}
          , "flat": false
          , "$1":
            { "type": "let*"
            , "bindings":
              [ [ "field_content"
                , { "type": "if"
                  , "cond": {"type": "var", "name": "RLIB"}
                  , "then": []
                  , "else": {"type": "FIELD", "name": "c_hdrs"}
                  }
                ]
              ]
            , "body": {"type": "CALL_EXPRESSION", "name": "get_artifacts"}
            }
          }
        ]
      , ["crate_root", {"type": "FIELD", "name": "crate_root"}]
      , ["edition", {"type": "FIELD", "name": "edition"}]
      , ["srcs", {"type": "FIELD", "name": "srcs"}]
      , ["deps", {"type": "FIELD", "name": "deps"}]
      , ["build_script", {"type": "FIELD", "name": "build_script"}]
      , ["cargo_features", {"type": "FIELD", "name": "cargo_features"}]
      , ["version", {"type": "FIELD", "name": "version"}]
      , ["pkg_name", {"type": "FIELD", "name": "pkg_name"}]
      , ["defaults", {"type": "FIELD", "name": "defaults"}]
      ]
    , "body": {"type": "CALL_EXPRESSION", "name": "call rustc"}
    }
  }
, "proc-macro":
  { "doc":
    [ "A Rust procedural macro. As it is executed on the host system"
    , "during the compilation, it is always compiled according to the"
    , "host configuration."
    ]
  , "string_fields": ["name", "edition", "stage", "version", "pkg_name"]
  , "target_fields":
    ["crate_root", "srcs", "deps", "cargo_features", "build_script"]
  , "field_doc":
    { "name": ["The name of the crate being built."]
    , "build_script":
      [ "The \"build_script\" target required to be built and run before"
      , "compiling this macro."
      ]
    , "cargo_features":
      ["List of cargo features this macro requires to be enabled."]
    , "crate_root":
      [ "The crate to be fed to the Rust compiler. It must evaluate to"
      , "a single artifact/file."
      ]
    , "defaults": ["The Rust toolchain to use."]
    , "deps": ["Any other libraries this macro depends upon."]
    , "edition":
      [ "The edition of the compiler to use during compilation. If"
      , "unset, 2015 is used."
      ]
    , "pkg_name":
      [ "The name of the package the crate belongs to. It is"
      , "exported to the CARGO_PKG_NAME environment variable."
      ]
    , "srcs": ["The source files of the procedural macro."]
    , "stage":
      [ "The logical location of the resulting artifact. Elements are"
      , "joined with \"/\"."
      ]
    , "version":
      [ "The crate version. Elements are joined with \".\" and the first"
      , "three elements are used for the major, minor, and patch"
      , "number respectively."
      ]
    }
  , "config_vars": ["ARCH", "HOST_ARCH", "ENV"]
  , "config_doc":
    { "ARCH":
      [ "Default value for both HOST_ARCH and TARGET_ARCH. It is user's"
      , "responsibility to adapt the \"defaults\" according to the"
      , "provided value."
      ]
    , "ENV":
      [ "Additional environment variables (besides ones provided by"
      , "the \"defaults\" target) to be set for each action. If the"
      , "same variable is set here and in the \"defaults\", the former"
      , "is taken."
      ]
    , "HOST_ARCH":
      [ "The host CPU architecture. It is user's responsibility to"
      , "adapt the \"defaults\" according to the provided value."
      ]
    }
  , "config_transitions":
    { "build_script": [{"type": "CALL_EXPRESSION", "name": "for host as rlib"}]
    , "cargo_features":
      [{"type": "CALL_EXPRESSION", "name": "for host as rlib"}]
    , "crate_root": [{"type": "CALL_EXPRESSION", "name": "for host"}]
    , "defaults": [{"type": "CALL_EXPRESSION", "name": "for host"}]
    , "deps": [{"type": "CALL_EXPRESSION", "name": "for host as rlib"}]
    , "srcs": [{"type": "CALL_EXPRESSION", "name": "for host"}]
    }
  , "imports":
    { "call rustc": "call rustc result"
    , "for host": "for host"
    , "for host as rlib": ["./", "../rust", "for host as rlib"]
    , "to rlib": "to rlib"
    }
  , "implicit": {"defaults": ["defaults"]}
  , "expression":
    { "type": "let*"
    , "bindings":
      [ ["crate_name", {"type": "FIELD", "name": "name"}]
      , ["crate_type", "proc-macro"]
      , [ "stage"
        , { "type": "if"
          , "cond": {"type": "FIELD", "name": "stage"}
          , "then":
            { "type": "join"
            , "$1": {"type": "FIELD", "name": "stage"}
            , "separator": "/"
            }
          , "else": "."
          }
        ]
      , ["crate_root", {"type": "FIELD", "name": "crate_root"}]
      , ["edition", {"type": "FIELD", "name": "edition"}]
      , ["srcs", {"type": "FIELD", "name": "srcs"}]
      , ["deps", {"type": "FIELD", "name": "deps"}]
      , [ "deps-transition"
        , {"type": "CALL_EXPRESSION", "name": "for host as rlib"}
        ]
      , ["transition", {"type": "CALL_EXPRESSION", "name": "for host"}]
      , ["version", {"type": "FIELD", "name": "version"}]
      , ["pkg_name", {"type": "FIELD", "name": "pkg_name"}]
      , ["build_script", {"type": "FIELD", "name": "build_script"}]
      , ["cargo_features", {"type": "FIELD", "name": "cargo_features"}]
      , ["defaults", {"type": "FIELD", "name": "defaults"}]
      ]
    , "body": {"type": "CALL_EXPRESSION", "name": "call rustc"}
    }
  }
, "test":
  { "doc": ["A Rust test."]
  , "string_fields":
    ["name", "edition", "stage", "version", "args", "pkg_name"]
  , "target_fields": ["crate_root", "srcs", "deps", "cargo_features", "data"]
  , "field_doc":
    { "name":
      [ "The name of the test being built. Note that during execution,"
      , "the test binary will be restaged to \"test\"."
      ]
    , "args": ["Additonal arguments to be passed when running the test."]
    , "cargo_features":
      ["List of cargo features this test requires to be enabled."]
    , "crate_root":
      [ "The crate to be fed to the Rust compiler. It must evaluate to"
      , "a single artifact/file."
      ]
    , "data": ["Any files and directories the test binary needs when running."]
    , "defaults": ["The Rust toolchain to use."]
    , "deps": ["Any other libraries this test depends upon."]
    , "edition":
      [ "The edition of the compiler to use during compilation. If"
      , "unset, 2015 is used."
      ]
    , "pkg_name":
      [ "The name of the package the crate belongs to. It is"
      , "exported to the CARGO_PKG_NAME environment variable."
      ]
    , "runner":
      [ "The test runner to use, i.e., the binary that will launch the"
      , "test binary and collect the output."
      ]
    , "srcs": ["The source files of the test."]
    , "stage":
      [ "The logical location of the resulting artifact. Elements are"
      , "joined with \"/\"."
      ]
    , "version":
      [ "The crate version. Elements are joined with \".\" and the first"
      , "three elements are used for the major, minor, and patch"
      , "number respectively."
      ]
    }
  , "config_vars": ["RUST_TEST_LAUNCHER", "ARCH", "HOST_ARCH", "ENV"]
  , "config_doc":
    { "ARCH":
      [ "Default value for both HOST_ARCH and TARGET_ARCH. It is user's"
      , "responsibility to adapt the \"defaults\" according to the"
      , "provided value."
      ]
    , "ENV":
      [ "Additional environment variables (besides ones provided by"
      , "the \"defaults\" target) to be set for each action. If the"
      , "same variable is set here and in the \"defaults\", the former"
      , "is taken."
      ]
    , "HOST_ARCH":
      [ "The host CPU architecture. It is user's responsibility to"
      , "adapt the \"defaults\" according to the provided value."
      ]
    , "RUST_TEST_LAUNCHER":
      [ "List of strings representing the launcher that is prepended to"
      , "the command line for running the test binary."
      ]
    }
  , "config_transitions":
    { "cargo_features":
      [{"type": "CALL_EXPRESSION", "name": "for host as rlib"}]
    , "crate_root": [{"type": "CALL_EXPRESSION", "name": "for host"}]
    , "data": [{"type": "CALL_EXPRESSION", "name": "for host"}]
    , "defaults": [{"type": "CALL_EXPRESSION", "name": "for host"}]
    , "deps": [{"type": "CALL_EXPRESSION", "name": "for host as rlib"}]
    , "runner": [{"type": "CALL_EXPRESSION", "name": "for host"}]
    , "srcs": [{"type": "CALL_EXPRESSION", "name": "for host"}]
    }
  , "imports":
    { "call rustc artifact": "call rustc artifact"
    , "for host": "for host"
    , "for host as rlib": ["./", "../rust", "for host as rlib"]
    , "get_artifacts": ["./", "..", "get_artifacts"]
    , "get_runfiles": ["./", "..", "get_runfiles"]
    , "get_unique_artifact": ["./", "..", "get_unique_artifact"]
    , "stage_unique_artifact": ["./", "..", "stage_unique_artifact"]
    }
  , "implicit": {"defaults": ["defaults"], "runner": ["runner.py"]}
  , "expression":
    { "type": "let*"
    , "bindings":
      [ ["crate_name", {"type": "FIELD", "name": "name"}]
      , ["crate_type", "bin"]
      , [ "stage"
        , { "type": "if"
          , "cond": {"type": "FIELD", "name": "stage"}
          , "then":
            { "type": "join"
            , "$1": {"type": "FIELD", "name": "stage"}
            , "separator": "/"
            }
          , "else": "."
          }
        ]
      , ["crate_root", {"type": "FIELD", "name": "crate_root"}]
      , ["edition", {"type": "FIELD", "name": "edition"}]
      , ["srcs", {"type": "FIELD", "name": "srcs"}]
      , ["deps", {"type": "FIELD", "name": "deps"}]
      , ["cargo_features", {"type": "FIELD", "name": "cargo_features"}]
      , ["emit", "link"]
      , [ "deps-transition"
        , {"type": "CALL_EXPRESSION", "name": "for host as rlib"}
        ]
      , ["transition", {"type": "CALL_EXPRESSION", "name": "for host"}]
      , ["test", true]
      , ["version", {"type": "FIELD", "name": "version"}]
      , ["pkg_name", {"type": "FIELD", "name": "pkg_name"}]
      , ["defaults", {"type": "FIELD", "name": "defaults"}]
      , [ "artifact result"
        , {"type": "CALL_EXPRESSION", "name": "call rustc artifact"}
        ]
      , [ "test"
        , { "type": "let*"
          , "bindings":
            [ [ "artifact"
              , { "type": "lookup"
                , "key": "artifact"
                , "map": {"type": "var", "name": "artifact result"}
                }
              ]
            , ["name", "test"]
            ]
          , "body":
            {"type": "CALL_EXPRESSION", "name": "stage_unique_artifact"}
          }
        ]
      , [ "runner"
        , { "type": "let*"
          , "bindings":
            [ [ "artifact"
              , { "type": "let*"
                , "bindings":
                  [ ["field_name", "runner"]
                  , ["field_content", {"type": "FIELD", "name": "runner"}]
                  ]
                , "body":
                  {"type": "CALL_EXPRESSION", "name": "get_unique_artifact"}
                }
              ]
            , ["name", "runner"]
            ]
          , "body":
            {"type": "CALL_EXPRESSION", "name": "stage_unique_artifact"}
          }
        ]
      , ["field_content", {"type": "FIELD", "name": "data"}]
      , [ "test-data"
        , { "type": "to_subdir"
          , "subdir": "work"
          , "flat": false
          , "$1":
            { "type": "disjoint_map_union"
            , "$1":
              [ {"type": "CALL_EXPRESSION", "name": "get_artifacts"}
              , {"type": "CALL_EXPRESSION", "name": "get_runfiles"}
              ]
            }
          }
        ]
      , [ "test-launcher"
        , { "type": "singleton_map"
          , "key": "test-launcher.json"
          , "value":
            { "type": "BLOB"
            , "data":
              { "type": "json_encode"
              , "$1":
                {"type": "var", "name": "RUST_TEST_LAUNCHER", "default": []}
              }
            }
          }
        ]
      , [ "test-args"
        , { "type": "singleton_map"
          , "key": "test-args.json"
          , "value":
            { "type": "BLOB"
            , "data":
              {"type": "json_encode", "$1": {"type": "FIELD", "name": "args"}}
            }
          }
        ]
      , [ "test-name"
        , {"type": "join", "$1": {"type": "var", "name": "crate_name"}}
        ]
      , [ "test-results"
        , { "type": "ACTION"
          , "outs": ["result", "stdout", "stderr", "time-start", "time-stop"]
          , "inputs":
            { "type": "map_union"
            , "$1":
              [ {"type": "var", "name": "test"}
              , {"type": "var", "name": "runner"}
              , {"type": "var", "name": "test-data"}
              , {"type": "var", "name": "test-launcher"}
              , {"type": "var", "name": "test-args"}
              ]
            }
          , "cmd": ["./runner"]
          , "env":
            { "type": "lookup"
            , "key": "env"
            , "map": {"type": "var", "name": "artifact result"}
            }
          , "may_fail": ["test"]
          , "fail_message":
            { "type": "join"
            , "$1":
              ["rust test", {"type": "var", "name": "test-name"}, "failed"]
            , "separator": " "
            }
          }
        ]
      ]
    , "body":
      { "type": "RESULT"
      , "artifacts": {"type": "var", "name": "test-results"}
      , "runfiles":
        { "type": "singleton_map"
        , "key": {"type": "var", "name": "test-name"}
        , "value":
          {"type": "TREE", "$1": {"type": "var", "name": "test-results"}}
        }
      }
    }
  , "tainted": ["test"]
  }
}