diff --git a/naga/src/diagnostic_filter.rs b/naga/src/diagnostic_filter.rs
index 80d841214..ca2c96fa5 100644
--- a/naga/src/diagnostic_filter.rs
+++ b/naga/src/diagnostic_filter.rs
@@ -27,22 +27,6 @@ pub enum Severity {
 }
 
 impl Severity {
-    const ERROR: &'static str = "error";
-    const WARNING: &'static str = "warning";
-    const INFO: &'static str = "info";
-    const OFF: &'static str = "off";
-
-    /// Convert from a sentinel word in WGSL into its associated [`Severity`], if possible.
-    pub fn from_wgsl_ident(s: &str) -> Option<Self> {
-        Some(match s {
-            Self::ERROR => Self::Error,
-            Self::WARNING => Self::Warning,
-            Self::INFO => Self::Info,
-            Self::OFF => Self::Off,
-            _ => return None,
-        })
-    }
-
     /// Checks whether this severity is [`Self::Error`].
     ///
     /// Naga does not yet support diagnostic items at lesser severities than
@@ -79,23 +63,6 @@ pub enum FilterableTriggeringRule {
 }
 
 impl FilterableTriggeringRule {
-    const DERIVATIVE_UNIFORMITY: &'static str = "derivative_uniformity";
-
-    /// Convert from a sentinel word in WGSL into its associated [`FilterableTriggeringRule`], if possible.
-    pub fn from_wgsl_ident(s: &str) -> Option<Self> {
-        Some(match s {
-            Self::DERIVATIVE_UNIFORMITY => Self::DerivativeUniformity,
-            _ => return None,
-        })
-    }
-
-    /// Maps this [`FilterableTriggeringRule`] into the sentinel word associated with it in WGSL.
-    pub const fn to_wgsl_ident(self) -> &'static str {
-        match self {
-            Self::DerivativeUniformity => Self::DERIVATIVE_UNIFORMITY,
-        }
-    }
-
     /// The default severity associated with this triggering rule.
     ///
     /// See <https://www.w3.org/TR/WGSL/#filterable-triggering-rules> for a table of default
diff --git a/naga/src/front/wgsl/diagnostic_filter.rs b/naga/src/front/wgsl/diagnostic_filter.rs
new file mode 100644
index 000000000..f505205b6
--- /dev/null
+++ b/naga/src/front/wgsl/diagnostic_filter.rs
@@ -0,0 +1,38 @@
+use crate::diagnostic_filter::{FilterableTriggeringRule, Severity};
+
+impl Severity {
+    const ERROR: &'static str = "error";
+    const WARNING: &'static str = "warning";
+    const INFO: &'static str = "info";
+    const OFF: &'static str = "off";
+
+    /// Convert from a sentinel word in WGSL into its associated [`Severity`], if possible.
+    pub fn from_wgsl_ident(s: &str) -> Option<Self> {
+        Some(match s {
+            Self::ERROR => Self::Error,
+            Self::WARNING => Self::Warning,
+            Self::INFO => Self::Info,
+            Self::OFF => Self::Off,
+            _ => return None,
+        })
+    }
+}
+
+impl FilterableTriggeringRule {
+    const DERIVATIVE_UNIFORMITY: &'static str = "derivative_uniformity";
+
+    /// Convert from a sentinel word in WGSL into its associated [`FilterableTriggeringRule`], if possible.
+    pub fn from_wgsl_ident(s: &str) -> Option<Self> {
+        Some(match s {
+            Self::DERIVATIVE_UNIFORMITY => Self::DerivativeUniformity,
+            _ => return None,
+        })
+    }
+
+    /// Maps this [`FilterableTriggeringRule`] into the sentinel word associated with it in WGSL.
+    pub const fn to_wgsl_ident(self) -> &'static str {
+        match self {
+            Self::DerivativeUniformity => Self::DERIVATIVE_UNIFORMITY,
+        }
+    }
+}
diff --git a/naga/src/front/wgsl/mod.rs b/naga/src/front/wgsl/mod.rs
index a54fd66f0..3106bbb9b 100644
--- a/naga/src/front/wgsl/mod.rs
+++ b/naga/src/front/wgsl/mod.rs
@@ -4,6 +4,7 @@ Frontend for [WGSL][wgsl] (WebGPU Shading Language).
 [wgsl]: https://gpuweb.github.io/gpuweb/wgsl.html
 */
 
+mod diagnostic_filter;
 mod error;
 mod index;
 mod lower;