Incorrect parsing behavior when function return types have precision qualifiers

[kpk47]

The parser throws an error when given a function whose return type has a precision qualifier.

Input:

lowp float foo(lowp float bar) {
  return 1.0;
}

Error:

Parse error: Error in input: Ln: 1 Col: 6
lowp float foo(lowp float bar) {
     ^
Expecting: Type qualifier, ';' or 'layout'

Expected output:

lowp float f(lowp float f){return 1.;}

The error goes away when you remove the precision qualifier from the return type:

float foo(lowp float bar) {
  return 1.0;
}

Output:

float f(lowp float f){return 1.;}