Add either to [workspace.dependencies].

Cargo.toml

@@ -62,6 +62,7 @@ exclude = [
 [workspace.dependencies]
 # tidy-alphabetical-start
 bitflags = "2.9.3"
+either = "1.15.0"
 itertools = "0.12.1"
 # FIXME: Remove this pin once this rustix issue is resolved
 # https://github.com/bytecodealliance/rustix/issues/1496

compiler/rustc_borrowck/Cargo.toml

@@ -5,7 +5,7 @@ edition = "2024"
 
 [dependencies]
 # tidy-alphabetical-start
-either = "1.5.0"
+either.workspace = true
 itertools.workspace = true
 polonius-engine = "0.13.0"
 rustc_abi = { path = "../rustc_abi" }

compiler/rustc_const_eval/Cargo.toml

@@ -5,7 +5,7 @@ edition = "2024"
 
 [dependencies]
 # tidy-alphabetical-start
-either = "1"
+either.workspace = true
 rustc_abi = { path = "../rustc_abi" }
 rustc_apfloat = "0.2.0"
 rustc_ast = { path = "../rustc_ast" }

compiler/rustc_data_structures/Cargo.toml

@@ -7,7 +7,7 @@ edition = "2024"
 # tidy-alphabetical-start
 arrayvec = { version = "0.7", default-features = false }
 bitflags.workspace = true
-either = "1.0"
+either.workspace = true
 elsa = "1.11.0"
 ena = "0.14.3"
 indexmap = "2.4.0"

compiler/rustc_middle/Cargo.toml

@@ -6,7 +6,7 @@ edition = "2024"
 [dependencies]
 # tidy-alphabetical-start
 bitflags.workspace = true
-either = "1.5.0"
+either.workspace = true
 gsgdt = "0.1.2"
 polonius-engine = "0.13.0"
 rustc_abi = { path = "../rustc_abi" }

compiler/rustc_mir_transform/Cargo.toml

@@ -5,7 +5,7 @@ edition = "2024"
 
 [dependencies]
 # tidy-alphabetical-start
-either = "1"
+either.workspace = true
 itertools.workspace = true
 rustc_abi = { path = "../rustc_abi" }
 rustc_arena = { path = "../rustc_arena" }