New, more flexible, parser context datatype that includes and extends

the previous flags allowForest and allowVarRef.
Added binary operator (work in progress).
Better implementation of +=,-=,*=, and /= (new) operators.

t_builtin-base_test.go

@@ -41,7 +41,7 @@ func TestFuncBase(t *testing.T) {
 		/*  27 */ {`dec(2.0)`, float64(2), nil},
 		/*  28 */ {`dec("2.0")`, float64(2), nil},
 		/*  29 */ {`dec(true)`, float64(1), nil},
-		/*  30 */ {`dec(true")`, nil, `[1:11] missing string termination "`},
+		/*  30 */ {`dec(true")`, nil, "[1:11] expected one of `,`, `)`, got `\"`"},
 		/*  31 */ {`dec()`, nil, `dec(): too few params -- expected 1, got 0`},
 		/*  32 */ {`dec(1,2,3)`, nil, `dec(): too many params -- expected 1, got 3`},
 		/*  33 */ {`isBool(false)`, true, nil},
@@ -61,6 +61,6 @@ func TestFuncBase(t *testing.T) {
 
 	t.Setenv("EXPR_PATH", ".")
 
-	//runTestSuiteSpec(t, section, inputs, 10)
+	// runTestSuiteSpec(t, section, inputs, 30)
 	runTestSuite(t, section, inputs)
 }