add test for 4708

This is fixed by backporting 3999

Author: ytmimi

tests/target/issue-4708/imports_granularity_crate.rs

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+// rustfmt-imports_granularity: Crate
+
+// See https://github.com/rust-lang/rustfmt/issues/4708
+pub use serenity::model::{
+    // channel::{Message, Reaction, ReactionType},
+    // gateway::Ready,
+    // guild::{Member, Role},
+    // id::{ChannelId, GuildId, MessageId, RoleId, UserId},
+    // permissions::Permissions,
+    prelude::*,
+    // user::User,
+};
+use {std::env::args /* this comment gets removed */};

tests/target/issue-4708/imports_granularity_item.rs

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+// rustfmt-imports_granularity: Item
+
+// See https://github.com/rust-lang/rustfmt/issues/4708
+pub use serenity::model::{
+    // channel::{Message, Reaction, ReactionType},
+    // gateway::Ready,
+    // guild::{Member, Role},
+    // id::{ChannelId, GuildId, MessageId, RoleId, UserId},
+    // permissions::Permissions,
+    prelude::*,
+    // user::User,
+};
+use {std::env::args /* this comment gets removed */};

tests/target/issue-4708/imports_granularity_module.rs

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+// rustfmt-imports_granularity: Module
+
+// See https://github.com/rust-lang/rustfmt/issues/4708
+pub use serenity::model::{
+    // channel::{Message, Reaction, ReactionType},
+    // gateway::Ready,
+    // guild::{Member, Role},
+    // id::{ChannelId, GuildId, MessageId, RoleId, UserId},
+    // permissions::Permissions,
+    prelude::*,
+    // user::User,
+};
+use {std::env::args /* this comment gets removed */};

tests/target/issue-4708/imports_granularity_one.rs

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+// rustfmt-imports_granularity: One
+
+// See https://github.com/rust-lang/rustfmt/issues/4708
+pub use serenity::model::{
+    // channel::{Message, Reaction, ReactionType},
+    // gateway::Ready,
+    // guild::{Member, Role},
+    // id::{ChannelId, GuildId, MessageId, RoleId, UserId},
+    // permissions::Permissions,
+    prelude::*,
+    // user::User,
+};
+use {std::env::args /* this comment gets removed */};

tests/target/issue-4708/imports_granularity_preserve.rs

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+// rustfmt-imports_granularity: Preserve
+
+// See https://github.com/rust-lang/rustfmt/issues/4708
+pub use serenity::model::{
+    // channel::{Message, Reaction, ReactionType},
+    // gateway::Ready,
+    // guild::{Member, Role},
+    // id::{ChannelId, GuildId, MessageId, RoleId, UserId},
+    // permissions::Permissions,
+    prelude::*,
+    // user::User,
+};
+use {std::env::args /* this comment gets removed */};