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doc/manual/source/language/expression/function-call.md

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+# Function Call Expression
+
+A function call expression applies a function value to arguments.
+
+```dcdl
+increment(41)
+```
+
+## Evaluation
+
+An argument is evaluated when the function body references it.
+If the argument is referenced several times, its evaluation result is reused.
+When a parameter has a range, the argument is refined using the same rules as `narrower as wider`.
+Fields present only in the parameter range remain abstract, and defaults are not selected at this point.