Can't mix offset/multiplier with upper/lower bounds

The following code:

data { 
  int<lower=0> N; 
  int<lower=0,upper=1> y[N];
} 
parameters {
  real<multiplier=1,lower=0,upper=1> theta;
} 
model {
  theta ~ beta(1,1);  // uniform prior on interval 0,1
  y ~ bernoulli(theta);
}

Gives the error:

   -------------------------------------------------
     4:  } 
     5:  parameters {
     6:    real<multiplier=1,offset=0,lower=0,upper=1> theta;
                                     ^
     7:  } 
     8:  model {
   -------------------------------------------------

Expected '>' after multiplier expression.

Should this be legal syntax?

Start by reproducing the Stan declaration in the issue and inspect the parser entry point for constrained parameter declarations. Review the discussion and closed pull request #971 before proceeding; done means the shown combination of multiplier, offset, lower, and upper bounds is accepted with appropriate parser coverage.