fix unary-related parsing regressions caused by #26154 (#26239)

This affects chains of unary operators, calls, and juxtaposition,
as in `-(f)(x)`.

src/julia-parser.scm

@@ -1039,11 +1039,13 @@
              (if (cdr parens) ;; found an argument list
                  (if opspc
                      (disallowed-space op #\( )
-                     (parse-factor-with-initial-ex
-                      s
-                      (fix-syntactic-unary (cons op (tuple-to-arglist (car parens))))))
+                     (parse-juxtapose
+                      (parse-factor-with-initial-ex
+                       s
+                       (fix-syntactic-unary (cons op (tuple-to-arglist (car parens)))))
+                      s))
                  (fix-syntactic-unary
-                  (list op (parse-factor-with-initial-ex s (car parens)))))))
+                  (list op (parse-juxtapose (parse-factor-with-initial-ex s (car parens)) s))))))
           ((not un)
            (error (string "\"" op "\" is not a unary operator")))
           (else
@@ -1098,10 +1100,10 @@
 ;; -2^3 is parsed as -(2^3), so call parse-decl for the first argument,
 ;; and parse-unary from then on (to handle 2^-3)
 (define (parse-factor s)
-  (parse-factor-with-initial-ex s (parse-call s)))
+  (parse-factor-with-initial-ex s (parse-unary-prefix s)))
 
 (define (parse-factor-with-initial-ex s ex0)
-  (let* ((ex (parse-decl-with-initial-ex s ex0))
+  (let* ((ex (parse-decl-with-initial-ex s (parse-call-with-initial-ex s ex0)))
          (t  (peek-token s)))
     (if (is-prec-power? t)
         (begin (take-token s)
@@ -1130,10 +1132,12 @@
 ;; parse function call, indexing, dot, and transpose expressions
 ;; also handles looking for syntactic reserved words
 (define (parse-call s)
-  (let ((ex (parse-unary-prefix s)))
-    (if (or (initial-reserved-word? ex) (eq? ex 'mutable) (eq? ex 'primitive) (eq? ex 'abstract))
-        (parse-resword s ex)
-        (parse-call-chain s ex #f))))
+  (parse-call-with-initial-ex s (parse-unary-prefix s)))
+
+(define (parse-call-with-initial-ex s ex)
+  (if (or (initial-reserved-word? ex) (eq? ex 'mutable) (eq? ex 'primitive) (eq? ex 'abstract))
+      (parse-resword s ex)
+      (parse-call-chain s ex #f)))
 
 (define (parse-unary-prefix s)
   (let ((op (peek-token s)))

test/syntax.jl

@@ -1341,3 +1341,13 @@ end
 
 @test Meta.parse("1 -+(a=1, b=2)") == Expr(:call, :-, 1,
                                            Expr(:call, :+, Expr(:kw, :a, 1), Expr(:kw, :b, 2)))
+
+@test Meta.parse("-(2)(x)") == Expr(:call, :-, Expr(:call, :*, 2, :x))
+@test Meta.parse("-(x)y")   == Expr(:call, :-, Expr(:call, :*, :x, :y))
+@test Meta.parse("-(x,)y")  == Expr(:call, :*, Expr(:call, :-, :x), :y)
+@test Meta.parse("-(f)(x)") == Expr(:call, :-, Expr(:call, :f, :x))
+@test Meta.parse("-(2)(x)^2") == Expr(:call, :-, Expr(:call, :*, 2, Expr(:call, :^, :x, 2)))
+@test Meta.parse("Y <- (x->true)(X)") ==
+    Expr(:call, :<, :Y,
+         Expr(:call, :-, Expr(:call, Expr(:->, :x, Expr(:block, LineNumberNode(1,:none), true)),
+                              :X)))