[nextest-runner] switch to toml_edit for parsing toml

This is needed for upcoming changes which check that TOML passed in over
`--config` is always of the form KEY=VALUE.

Author: sunshowers

Cargo.lock

@@ -58,7 +58,7 @@ tokio = { version = "1.20.1", features = [
     "sync",
     "time",
 ] }
-toml = "0.5.9"
+toml_edit = { version = "0.14.4", features = ["easy"] }
 twox-hash = { version = "1.6.3", default-features = false }
 zstd = { version = "0.11.2", features = ["zstdmt"] }
 

nextest-runner/Cargo.toml

@@ -221,7 +221,7 @@ fn parse_cli_configs(
         .map(|config_str| {
             // Each cargo config is expected to be a valid TOML file.
             let config_str = config_str.as_ref();
-            let config = toml::from_str(config_str).map_err(|error| {
+            let config = toml_edit::easy::from_str(config_str).map_err(|error| {
                 CargoConfigsConstructError::CliConfigParseError {
                     config_str: config_str.to_owned(),
                     error,
@@ -310,12 +310,13 @@ fn discover_impl(
                     error,
                 }
             })?;
-            let config: CargoConfig = toml::from_str(&config_contents).map_err(|error| {
-                CargoConfigSearchError::ConfigParseError {
-                    path: path.clone(),
-                    error,
-                }
-            })?;
+            let config: CargoConfig =
+                toml_edit::easy::from_str(&config_contents).map_err(|error| {
+                    CargoConfigSearchError::ConfigParseError {
+                        path: path.clone(),
+                        error,
+                    }
+                })?;
             Ok((CargoConfigSource::File(path), config))
         })
         .collect::<Result<Vec<_>, CargoConfigSearchError>>()?;

nextest-runner/src/cargo_config.rs

@@ -804,7 +804,7 @@ pub enum CargoConfigsConstructError {
 
         /// The error that occurred trying to deserialize the config.
         #[source]
-        error: toml::de::Error,
+        error: toml_edit::easy::de::Error,
     },
 }
 
@@ -850,7 +850,7 @@ pub enum CargoConfigSearchError {
 
         /// The error that occurred trying to deserialize the config file
         #[source]
-        error: toml::de::Error,
+        error: toml_edit::easy::de::Error,
     },
 }