Fix coeff dict duplicate variable and function name issue

src/types.jl

@@ -463,9 +463,9 @@ ratio(x::Integer,y::Integer) = iszero(rem(x,y)) ? div(x,y) : x//y
 ratio(x::Rat,y::Rat) = x//y
 function maybe_intcoeff(x)
     if ismul(x)
-        coeff = coeff(x)
-        if coeff isa Rational && isone(denominator(coeff))
-            _Mul(symtype(x), coeff.num, dict(x); metadata = x.metadata)
+        coefficient = coeff(x)
+        if coefficient isa Rational && isone(denominator(coefficient))
+            _Mul(symtype(x), coefficient.num, dict(x); metadata = x.metadata)
         else
             x
         end
@@ -566,16 +566,16 @@ $(SIGNATURES)
 Any Muls inside an Add should always have a coeff of 1
 and the key (in Add) should instead be used to store the actual coefficient
 """
-function makeadd(sign, coeff, xs...)
+function makeadd(sign, coefficient, xs...)
     d = Dict{BasicSymbolic, Any}()
     for x in xs
         if isadd(x)
-            coeff += coeff(x)
+            coefficient += coeff(x)
             _merge!(+, d, dict(x), filter = _iszero)
             continue
         end
         if x isa Number
-            coeff += x
+            coefficient += x
             continue
         end
         if ismul(x)
@@ -591,17 +591,17 @@ function makeadd(sign, coeff, xs...)
             d[k] = v
         end
     end
-    coeff, d
+    coefficient, d
 end
 
-function makemul(coeff, xs...; d = Dict{BasicSymbolic, Any}())
+function makemul(coefficient, xs...; d = Dict{BasicSymbolic, Any}())
     for x in xs
         if ispow(x) && x.impl.exp isa Number
             d[x.impl.base] = x.impl.exp + get(d, x.impl.base, 0)
         elseif x isa Number
-            coeff *= x
+            coefficient *= x
         elseif ismul(x)
-            coeff *= coeff(x)
+            coefficient *= coeff(x)
             _merge!(+, d, dict(x), filter = _iszero)
         else
             v = 1 + get(d, x, 0)
@@ -612,7 +612,7 @@ function makemul(coeff, xs...; d = Dict{BasicSymbolic, Any}())
             end
         end
     end
-    coeff, d
+    coefficient, d
 end
 
 unstable_pow(a, b) = a isa Integer && b isa Integer ? (a // 1)^b : a^b
@@ -1229,13 +1229,13 @@ function +(a::SN, b::SN)
         return _Add(
             add_t(a, b), coeff(a) + coeff(b), _merge(+, dict(a), dict(b), filter = _iszero))
     elseif isadd(a)
-        coeff, dict = makeadd(1, 0, b)
-        return _Add(add_t(a, b), coeff(a) + coeff, _merge(+, dict(a), dict, filter = _iszero))
+        coefficient, dictionary = makeadd(1, 0, b)
+        return _Add(add_t(a, b), coeff(a) + coefficient, _merge(+, dict(a), dictionary, filter = _iszero))
     elseif isadd(b)
         return b + a
     end
-    coeff, dict = makeadd(1, 0, a, b)
-    _Add(add_t(a, b), coeff, dict)
+    coefficient, dictionary = makeadd(1, 0, a, b)
+    _Add(add_t(a, b), coefficient, dictionary)
 end
 function +(a::Number, b::SN)
     if isconst(b)
@@ -1354,9 +1354,9 @@ function ^(a::SN, b)
     elseif b isa Number && b < 0
         _Div(1, a^(-b))
     elseif ismul(a) && b isa Number
-        coeff = unstable_pow(coeff(a), b)
+        coefficient = unstable_pow(coeff(a), b)
         _Mul(promote_symtype(^, symtype(a), symtype(b)),
-            coeff, mapvalues((k, v) -> b * v, dict(a)))
+            coefficient, mapvalues((k, v) -> b * v, dict(a)))
     else
         _Pow(a, b)
     end