Method setFunction

checker/env.go:250–276

setFunction adds the function Decl to the Env. Adds a function decl if one doesn't already exist, then adds all overloads from the Decl. If overload overlaps with an existing overload, adds to the errors in the Env instead.

(fn *decls.FunctionDecl)

// Adds a function decl if one doesn't already exist, then adds all overloads from the Decl.
// If overload overlaps with an existing overload, adds to the errors  in the Env instead.
func (e *Env) setFunction(fn *decls.FunctionDecl) []errorMsg {
	errMsgs := make([]errorMsg, 0)
	current := e.declarations.FindFunction(fn.Name())
	if current != nil {
		var err error
		current, err = current.Merge(fn)
		if err != nil {
			return append(errMsgs, errorMsg(err.Error()))
		}
	} else {
		current = fn
	}
	for _, overload := range current.OverloadDecls() {
		for _, macro := range parser.AllMacros {
			if macro.Function() == current.Name() &&
				macro.IsReceiverStyle() == overload.IsMemberFunction() &&
				macro.ArgCount() == len(overload.ArgTypes()) {
				errMsgs = append(errMsgs, overlappingMacroError(current.Name(), macro.ArgCount()))
			}
		}
		if len(errMsgs) > 0 {
			return errMsgs
		}
	}
	e.declarations.SetFunction(current)
	return errMsgs
}

func maybeMergeConstant(a *decls.VariableDecl, b *decls.VariableDecl) (*decls.VariableDecl, errorMsg) {
	if b.Value() != nil {