ci: bump MSRV to fix test jobs (#519)

* ci: bump MSRV to fix test jobs

Signed-off-by: Luca BRUNO <[email protected]>

* src: fix new linting warnings

Signed-off-by: Luca BRUNO <[email protected]>

---------

Signed-off-by: Luca BRUNO <[email protected]>

Author: lucab

.github/workflows/rust.yml

@@ -9,9 +9,9 @@ on:
 env:
   CARGO_TERM_COLOR: always
   # Pinned toolchain for linting and benchmarks
-  ACTIONS_LINTS_TOOLCHAIN: 1.70.0
+  ACTIONS_LINTS_TOOLCHAIN: 1.78.0
   # Minimum supported Rust version (MSRV)
-  ACTION_MSRV_TOOLCHAIN: 1.70.0
+  ACTION_MSRV_TOOLCHAIN: 1.74.0
   EXTRA_FEATURES: "protobuf push process"
 
 jobs:

src/registry.rs

@@ -183,8 +183,8 @@ impl RegistryCore {
 
         // Write out MetricFamilies sorted by their name.
         mf_by_name
-            .into_iter()
-            .map(|(_, mut m)| {
+            .into_values()
+            .map(|mut m| {
                 // Add registry namespace prefix, if any.
                 if let Some(ref namespace) = self.prefix {
                     let prefixed = format!("{}_{}", namespace, m.get_name());

static-metric/src/auto_flush_builder.rs

@@ -714,7 +714,6 @@ impl<'a> MetricBuilderContext<'a> {
                         })#local_suffix_call,
                     }
                 } else {
-                    let prev_labels_ident = prev_labels_ident;
                     quote! {
                         #name: #member_type::from(
                             #(

static-metric/src/builder.rs

@@ -300,7 +300,6 @@ impl<'a> MetricBuilderContext<'a> {
                         })#local_suffix_call,
                     }
                 } else {
-                    let prev_labels_ident = prev_labels_ident;
                     quote! {
                         #name: #member_type::from(
                             #(