Rust: Change concat to strictconcat

Author: What Is Blog Post Looks Like

rust/ql/lib/codeql/rust/elements/internal/StructFieldImpl.qll

@@ -30,7 +30,9 @@ module Impl {
  /** Holds if this record field is named `name` and belongs to the struct `s`. */
  predicate isStructField(Struct s, string name) { this = s.getStructField(name) }
 
- override string toStringImpl() { result = concat(int i | | this.toStringPart(i) order by i) }
+ override string toStringImpl() {
+ result = strictconcat(int i | | this.toStringPart(i) order by i)
+ }
 
  private string toStringPart(int index) {
  index = 0 and result = this.getVisibility().toAbbreviatedString() + " "