Report a failure and exit if type checking fails

Type checking failures were previously not reported and the file was
silently ignored. This change will report the error and halt further
processing.

core/analyzer.go

@@ -16,6 +16,7 @@
 package core
 
 import (
+	"fmt"
 	"go/ast"
 	"go/importer"
 	"go/parser"
@@ -123,10 +124,9 @@ func (gas *Analyzer) process(filename string, source interface{}) error {
 		}
 
 		conf := types.Config{Importer: importer.Default()}
-		gas.context.Pkg, _ = conf.Check("pkg", gas.context.FileSet, []*ast.File{root}, gas.context.Info)
+		gas.context.Pkg, err = conf.Check("pkg", gas.context.FileSet, []*ast.File{root}, gas.context.Info)
 		if err != nil {
-			gas.logger.Println("failed to check imports")
-			return err
+			return fmt.Errorf(`Error during type checking: "%s"`, err)
 		}
 
 		gas.context.Imports = NewImportInfo()

main.go

@@ -176,7 +176,7 @@ func main() {
 	// Ensure at least one file was specified
 	if flag.NArg() == 0 {
 
-		fmt.Fprintf(os.Stderr, "\nerror: FILE [FILE...] or './...' expected\n")
+		fmt.Fprintf(os.Stderr, "\nError: FILE [FILE...] or './...' expected\n")
 		flag.Usage()
 		os.Exit(1)
 	}
@@ -195,9 +195,11 @@ func main() {
 	toAnalyze := getFilesToAnalyze(flag.Args(), excluded)
 
 	for _, file := range toAnalyze {
-		logger.Printf("scanning \"%s\"\n", file)
+		logger.Printf(`Processing "%s"...`, file)
 		if err := analyzer.Process(file); err != nil {
-			logger.Fatal(err)
+			logger.Printf(`Failed to process: "%s"`, file)
+			logger.Println(err)
+			logger.Fatalf(`Halting execution.`)
 		}
 	}