gen: make "." the default constructor regex pattern

gen/fzgen.go

@@ -68,7 +68,7 @@ func FzgenMain() int {
 	chainFlag := flag.Bool("chain", false, "loop over the methods of an object, which requires finding a suitable constructor in the same package and which is controllable via the -ctor flag.")
 	parallelFlag := flag.Bool("parallel", false, "indicates an emitted chain can be run in parallel. requires -chain")
 	outFileFlag := flag.String("o", "autofuzz_test.go", "output file name. defaults to autofuzz_test.go or autofuzzchain_test.go")
-	constructorPatternFlag := flag.String("ctor", "^New", "regexp to use if searching for constructors to automatically use.")
+	constructorPatternFlag := flag.String("ctor", ".", "regexp to use if searching for constructors to automatically use.")
 
 	// Less commonly used:
 	funcPatternFlag := flag.String("func", ".", "function regex, defaults to matching all candidate functions")

gen/genfuncs.go

@@ -197,7 +197,7 @@ func emitIndependentWrapper(emit emitFunc, function mod.Func, constructors []mod
 	if support == noSupport {
 		// skip this wrapper.
 		emit("// skipping %s because parameters include func, chan, or unsupported interface: %v\n\n", wrapperName, unsupportedParam)
-		return fmt.Errorf("%w: %s", errUnsupportedParams, unsupportedParam)
+		return fmt.Errorf("%w: %s takes %s", errUnsupportedParams, function.FuncName, unsupportedParam)
 	}
 
 	// Start emitting the wrapper function!

gen/genfuncsloop.go

@@ -326,7 +326,7 @@ func emitChainTarget(emit emitFunc, function mod.Func, qualifyAll bool) error {
 	if support == noSupport {
 		// we can't emit this chain target.
 		emit("// skipping %s because parameters include func, chan, or unsupported interface: %v\n\n", wrapperName, unsupportedParam)
-		return fmt.Errorf("%w: %s", errUnsupportedParams, unsupportedParam)
+		return fmt.Errorf("%w: %s takes %s", errUnsupportedParams, function.FuncName, unsupportedParam)
 	}
 
 	// Start emitting the wrapper function!

testscripts/external_tailscale.txt

@@ -23,7 +23,7 @@ exec gotip mod tidy
 exec gotip get github.com/thepudds/fzgen/fuzzer
 exec gotip get -d ./...
 fzgen ./...
-stdout 'fzgen: created 87 files'
+stdout 'fzgen: created 91 files'
 exec gotip test -exec=true ./...
 fzgen -chain -ctor=. ./...
 stdout 'fzgen: created 23 files'