svd-rs: fix write constraint check

Fixes the write constraint check to avoid a run-time panic when the
bit-range width is set to `64`.

Also avoids an unnecessary check, since all `u64` values will be valid.

Author: rmsyn

svd-rs/CHANGELOG.md

@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ## Unreleased
 
 - Add `DataType`
+- Fix run-time panic for write constraint check
 
 ## [v0.14.8] - 2024-02-13
 

svd-rs/src/field.rs

@@ -336,8 +336,13 @@ impl FieldInfo {
                 }
             }
 
-            if let Some(WriteConstraint::Range(constraint)) = self.write_constraint {
-                constraint.check_range(0..2_u64.pow(self.bit_range.width))?;
+            match self.write_constraint {
+                // If the bit_range has its maximum width, all values will of
+                // course fit in so we can skip validation.
+                Some(WriteConstraint::Range(constraint)) if self.bit_range.width < 64 => {
+                    constraint.check_range(0..2_u64.pow(self.bit_range.width))?;
+                }
+                _ => (),
             }
         }