Run New, NewTemplate and FakeStruct through one bind pipeline naming where they differ

README.md

@@ -890,7 +890,7 @@ transform.go    the builtins that rewrite an operand's value, and the ASCII fold
 calc.go         the {calc()} arithmetic evaluator: parser, eval, validation
 datatype.go     column datatypes: DataType, where datatype and null may sit, a column's datatype
 value.go        the value proof: what a typed column or calc operand holds, checked at load
-data.go         the load path: fs.FS folders/files -> merged namespace tree, and the fence order a scope runs
+data.go         the load path: fs.FS folders/files -> merged namespace tree, and the bind pipeline every entry point runs
 cmd/fejkdata/   the fejkdata CLI
 data/           shipped data (JSON, and a TSV per table), embedded at build: locale folders, geo, misc
 data-import/    the scripts that rebuild each sourced table (see DATA-LICENSES.md)

data.go

@@ -62,17 +62,7 @@ func loadData(sources []dataSource) (map[string]node, error) {
 	if len(root) == 0 {
 		return nil, fmt.Errorf("no .json data found")
 	}
-	setTablePaths(root)
-	if err := linkTables(root); err != nil {
-		return nil, err
-	}
-	if err := linkRefs(root); err != nil {
-		return nil, err
-	}
-	if err := checkNoCycles(root); err != nil {
-		return nil, err
-	}
-	if err := checkScope(treeScope(root)); err != nil {
+	if err := treeBinding(root).bind(); err != nil {
 		return nil, err
 	}
 	return root, nil
@@ -206,11 +196,50 @@ func inlineScope(n node, label string) nodeScope {
 	return func(fn func(path string, m node) error) error { return eachNode(n, label, fn) }
 }
 
-func checkScope(s nodeScope) error {
-	if err := checkColumns(s); err != nil {
+// binding is one entry point's nodes on their way through bind, the load pipeline New,
+// NewTemplate and FakeStruct share; its fields are where they differ.
+type binding struct {
+	scope nodeScope
+	// link binds the references: a loaded tree's relative to each category's folder, an
+	// inline node's from the root alone.
+	link func() error
+	// noCycles refuses a reference cycle, which only a loaded tree can close: nothing
+	// references an inline node.
+	noCycles func() error
+	// typedByGo marks a struct's columns, whose datatypes its Go types set and checkField
+	// proves, so checkColumns skips them.
+	typedByGo bool
+}
+
+func treeBinding(root map[string]node) binding {
+	return binding{
+		scope: treeScope(root),
+		link: func() error {
+			setTablePaths(root)
+			if err := linkTables(root); err != nil {
 				return err
 			}
-	return checkRenders(s)
+			return linkRefs(root)
+		},
+		noCycles: func() error { return checkNoCycles(root) },
+	}
+}
+
+func (b binding) bind() error {
+	if err := b.link(); err != nil {
+		return err
+	}
+	if b.noCycles != nil {
+		if err := b.noCycles(); err != nil {
+			return err
+		}
+	}
+	if !b.typedByGo {
+		if err := checkColumns(b.scope); err != nil {
+			return err
+		}
+	}
+	return checkRenders(b.scope)
 }
 
 // checkRenders runs the per-node fences over a scope, each over the whole scope

docs/decisions.md

@@ -57,7 +57,7 @@ tags and any other caller read one.
 
 `New` proves the loaded tree acyclic, an inline node is a finite tree of its own, and
 nothing in the tree can reference it, so no render of it reaches itself. Every other
-fence runs over both, from one `checkScope`, except that struct tags leave column
+fence runs over both, from one `binding.bind`, except that struct tags leave column
 agreement to their Go types.
 
 ## An inline template that does not compile is misuse (exit 2), including a reference that resolves to nothing

inline.go

@@ -32,7 +32,7 @@ func (f *Generator) NewTemplate(input string) (*Template, error) {
 	if err != nil {
 		return nil, fmt.Errorf("fejkdata: %w", err)
 	}
-	if err := bindInline(n, "template", f.categories, checkScope); err != nil {
+	if err := inlineBinding(n, "template", f.categories).bind(); err != nil {
 		return nil, fmt.Errorf("fejkdata: %w", err)
 	}
 	return &Template{g: f, n: n}, nil
@@ -146,17 +146,17 @@ func inputValue(input string) (any, error) {
 	return raw, nil
 }
 
-// bindInline links an inline node's references against root and runs check over it, naming its
-// nodes from label.
-func bindInline(n node, label string, root map[string]node, check func(nodeScope) error) error {
+// inlineBinding binds an inline node against root, naming its nodes from label.
+func inlineBinding(n node, label string, root map[string]node) binding {
+	scope := inlineScope(n, label)
+	return binding{scope: scope, link: func() error { return linkInline(n, label, scope, root) }}
+}
+
+func linkInline(n node, label string, scope nodeScope, root map[string]node) error {
 	if t, isTemplate := n.(*template); isTemplate && t.drawGroup != "" {
 		return fmt.Errorf("%s: drawGroup %q names nothing, since nothing can reference an inline template; drop it", label, t.drawGroup)
 	}
-	scope := inlineScope(n, label)
-	if err := linkNodeRefs(scope, root); err != nil {
-		return err
-	}
-	return check(scope)
+	return linkNodeRefs(scope, root)
 }
 
 // linkNodeRefs binds the references in an inline node's templates against the

node_test.go

@@ -107,7 +107,7 @@ func TestEveryFormatCompilesAtLink(t *testing.T) {
 			t.Errorf("%s compiled before link", format)
 		}
 	}
-	if err := bindInline(n, "t", map[string]node{"w": w}, func(nodeScope) error { return nil }); err != nil {
+	if err := linkInline(n, "t", inlineScope(n, "t"), map[string]node{"w": w}); err != nil {
 		t.Fatal(err)
 	}
 	for format, has := range compiledByPath() {

struct.go

@@ -258,7 +258,9 @@ func (s *structShape) compileRecord(categories map[string]node, t reflect.Type,
 	if err != nil {
 		return fmt.Errorf("%s: %w", label, err)
 	}
-	if err := bindInline(n, label, categories, checkRenders); err != nil {
+	b := inlineBinding(n, label, categories)
+	b.typedByGo = true
+	if err := b.bind(); err != nil {
 		return err
 	}
 	record, columns, err := recordOf(n)

todo.md

@@ -21,8 +21,6 @@ Self-sufficiency 5.6), every seat capped by Locality, and all nine naming
 
 This round, in order:
 
-- Run `New`, `NewTemplate` and `FakeStruct` through one bind pipeline that names
-  where they differ: each picks its own fences today.
 - Make `disagreement` and `bothTyped` a table of cases: each swaps its operands and
   runs a proof to pick an error's wording.
 - Derive a column's datatype in one place: `columnItems` yields nothing for a