Syntax error reported in wrong tslint.json file

[ghost]

Bug Report

• TSLint version: 5.0.0-dev.0
• TypeScript version: 2.3.0-dev.20170328
• Running TSLint via: CLI

TypeScript code being linted

(irrelevant)

with tslint.json configuration:

tslint.json: { "extends": "./foo.json" }
foo.json: syntax error

Actual behavior

Failed to load tslint.json: Unexpected token s in JSON at position 0

Expected behavior

Failed to load foo.json: Unexpected token s in JSON at position 0