exclude maphash methods that "never fail"

Author: djdv

errcheck/excludes.go

@@ -47,6 +47,11 @@ var DefaultExcludedSymbols = []string{
 
 	// hash
 	"(hash.Hash).Write",
+
+	// hash/maphash
+	"(*hash/maphash.Hash).Write",
+	"(*hash/maphash.Hash).WriteByte",
+	"(*hash/maphash.Hash).WriteString",
 }
 
 // ReadExcludes reads an excludes file, a newline delimited file that lists

testdata/hash.go

@@ -0,0 +1,11 @@
+package main
+
+import "hash/maphash"
+
+
+func ignoreHashMapReturns() {
+	var hasher maphash.Hash
+	hasher.Write(nil)      // EXCLUDED
+	hasher.WriteByte(0)    // EXCLUDED
+	hasher.WriteString("") // EXCLUDED
+}