Rust: Ensure that TPositionalArgumentPosition is large enough for struct expressions

Author: paldepind

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

@@ -9,7 +9,12 @@ module Impl {
       // For the type `FunctionPosition` used by type inference, we work with function-call syntax
       // adjusted positions, so a call like `x.m(a, b, c)` needs positions `0` through `3`; for this
       // reason, there is no `- 1` after `max(...)` below.
-      i in [0 .. max([any(ParamList l).getNumberOfParams(), any(ArgList l).getNumberOfArgs()])]
+      i in [0 .. max([
+                any(ParamList l).getNumberOfParams(),
+                any(ArgList l).getNumberOfArgs(),
+                any(StructFieldList l).getNumberOfFields() // Positions are used for struct expressions in type inference
+              ]
+          )]
     } or
     TSelfArgumentPosition() or
     TTypeQualifierArgumentPosition()