Package analysisutil defines various helper functions used by two or more packages beneath go/analysis.
Format returns a string representation of the expression.
HasSideEffects reports whether evaluation of e has side effects.
LineStart returns the position of the start of the specified line within file f, or NoPos if there is no line of that number.
ReadFile reads a file and adds it to the FileSet so that we can report errors against it using lineStart.
Unparen returns e with any enclosing parentheses stripped.