fgm/waiig15: My version of the Writing an Interpreter in Go 1.5 code. @ b69b615e71b516904d9a313a3aadf95d3aa59468

Frederic G. MARAND 3f83d07e0a §2.5 parsing return statements. One pass of golint cleanup.		%!s(int64=6) %!d(string=hai) anos
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parser.go	3f83d07e0a §2.5 parsing return statements. One pass of golint cleanup.	%!s(int64=6) %!d(string=hai) anos
parser_let.go	3f83d07e0a §2.5 parsing return statements. One pass of golint cleanup.	%!s(int64=6) %!d(string=hai) anos
parser_let_test.go	3f83d07e0a §2.5 parsing return statements. One pass of golint cleanup.	%!s(int64=6) %!d(string=hai) anos
parser_return.go	3f83d07e0a §2.5 parsing return statements. One pass of golint cleanup.	%!s(int64=6) %!d(string=hai) anos
parser_return_test.go	3f83d07e0a §2.5 parsing return statements. One pass of golint cleanup.	%!s(int64=6) %!d(string=hai) anos
parser_test.go	3f83d07e0a §2.5 parsing return statements. One pass of golint cleanup.	%!s(int64=6) %!d(string=hai) anos