chore: Set MSRV to 1.68 and pin indexmap to fix CI faliure

.github/workflows/main.yml

@@ -62,7 +62,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        rust: ['1.82.0', stable, nightly]
+        rust: ['1.68.0', stable, nightly]
         os: [ubuntu-latest, macOS-latest]
 
     steps:

bin/cargo-bolero/Cargo.toml

@@ -9,7 +9,7 @@ keywords = ["testing", "quickcheck", "property", "fuzz", "fuzzing"]
 license = "MIT"
 edition = "2021"
 readme = "README.md"
-rust-version = "1.82.0"
+rust-version = "1.76.0"
 
 [features]
 default = ["afl", "libfuzzer", "kani"]

bin/cargo-bolero/src/project.rs

@@ -171,7 +171,7 @@ impl Project {
                 // https://github.com/rust-lang/rust/pull/88243
 
                 let is_rust_159 = version_meta.semver.major == 1 && version_meta.semver.minor >= 59;
-                let is_llvm_13 = version_meta.llvm_version.is_none_or(|v| v.major >= 13);
+                let is_llvm_13 = version_meta.llvm_version.map_or(true, |v| v.major >= 13);
 
                 Some(if is_rust_159 && is_llvm_13 {
                     &"-Cpasses=sancov-module"

bin/clippy.toml

@@ -1 +1 @@
-msrv = "1.82.0"
+msrv = "1.76.0"

bin/rust-toolchain

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "1.82.0"
+channel = "1.76.0"
 components = [ "rustc", "clippy", "rustfmt" ]

clippy.toml

@@ -1 +1 @@
-msrv = "1.82.0"
+msrv = "1.68.0"

lib/bolero-engine/Cargo.toml

@@ -9,7 +9,7 @@ keywords = ["testing", "quickcheck", "property", "fuzz", "fuzzing"]
 license = "MIT"
 edition = "2021"
 readme = "../../README.md"
-rust-version = "1.82.0"
+rust-version = "1.68.0"
 
 [features]
 any = ["bolero-generator/any"]

lib/bolero-generator-derive/Cargo.toml

@@ -14,9 +14,11 @@ readme = "../bolero-generator/README.md"
 proc-macro = true
 
 [dependencies]
-proc-macro-crate = "3"
+proc-macro-crate = "2"
 proc-macro2 = "1"
 quote = "1"
 # The `full` feature is required to correctly parse attributes
 # TODO investigate if this can be reduced in scope
 syn = { version = "2", features = ["full"] }
+# Pin transitive MSRV bump (pulled via proc-macro-crate -> toml_edit -> indexmap)
+indexmap = "=2.11.2"

lib/bolero-generator-derive/src/lib.rs

@@ -2,7 +2,9 @@ extern crate proc_macro;
 
 mod generator_attr;
 
+// Ensure the pinned dependency is considered "used" (avoids unused-deps lint in CI).
 use generator_attr::GeneratorAttr;
+use indexmap as _;
 use proc_macro::TokenStream;
 use proc_macro2::{Span, TokenStream as TokenStream2};
 use proc_macro_crate::{crate_name, FoundCrate};

lib/bolero-generator/Cargo.toml

@@ -9,7 +9,7 @@ keywords = ["testing", "quickcheck", "property", "fuzz", "fuzzing"]
 license = "MIT"
 edition = "2021"
 readme = "README.md"
-rust-version = "1.82.0"
+rust-version = "1.68.0"
 
 [features]
 default = ["any", "either", "std"]

lib/bolero/Cargo.toml

@@ -9,7 +9,7 @@ keywords = ["testing", "quickcheck", "property", "fuzz", "fuzzing"]
 license = "MIT"
 edition = "2021"
 readme = "../../README.md"
-rust-version = "1.82.0"
+rust-version = "1.68.0"
 
 [features]
 default = ["std"]

lib/clippy.toml

@@ -1 +1 @@
-msrv = "1.82.0"
+msrv = "1.68.0"

lib/rust-toolchain

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "1.82.0"
+channel = "1.68.0"
 components = [ "rustc", "clippy", "rustfmt" ]

tests/src/bolero.rs

@@ -4,7 +4,7 @@ use xshell::{cmd, Shell};
 pub fn test() -> Result {
     let rust_version = env::rustc();
 
-    let supports_arbitrary = rust_version.is_none_or(|v| v.major > 1 && v.minor >= 63);
+    let supports_arbitrary = rust_version.map_or(true, |v| v.major > 1 && v.minor >= 63);
 
     Test { supports_arbitrary }.run()?;
 

tests/src/cargo_bolero.rs

@@ -4,7 +4,7 @@ use xshell::{cmd, Shell};
 pub fn test() -> Result {
     let rust_version = env::rustc();
 
-    let use_stable = rust_version.is_some_and(|v| v.major > 1 && v.minor <= 65);
+    let use_stable = rust_version.map_or(false, |v| v.major > 1 && v.minor <= 65);
 
     Test { use_stable }.run()?;
 

tests/src/engines.rs

@@ -2,7 +2,7 @@ use crate::{env, Result};
 use xshell::{cmd, Shell};
 
 pub fn test() -> Result {
-    let is_nightly = env::rustc_build().is_some_and(|b| b == "nightly");
+    let is_nightly = env::rustc_build().map_or(false, |b| b == "nightly");
 
     for engine in ["random", "libfuzzer", "afl", "honggfuzz", "kani"] {
         // TODO fix honggfuzz

tests/src/reduce.rs

@@ -3,7 +3,7 @@ use std::{fs, path::PathBuf};
 use xshell::{cmd, Shell};
 
 pub fn test() -> Result {
-    let is_nightly = env::rustc_build().is_some_and(|b| b == "nightly");
+    let is_nightly = env::rustc_build().map_or(false, |b| b == "nightly");
 
     Test {
         rustc_bootstrap: !is_nightly,