allow @foo{...} macro calls (#34505)

Author: stevengj

NEWS.md

@@ -3,7 +3,7 @@ Julia v1.5 Release Notes
 
 New language features
 ---------------------
-
+* Macro calls `@foo {...}` can now also be written `@foo{...}` (without the space) ([#34498]).
 
 Language changes
 ----------------

src/julia-parser.scm

@@ -1241,7 +1241,10 @@
             ((#\{ )
              (disallow-space s ex t)
              (take-token s)
-             (loop (list* 'curly ex (parse-call-arglist s #\} ))))
+             (let ((args (parse-call-arglist s #\} )))
+               (if macrocall?
+                   `(call ,ex (braces ,@args))
+                   (loop (list* 'curly ex args)))))
             ((#\" #\`)
              (if (and (or (symbol? ex) (valid-modref? ex))
                       (not (operator? ex))

test/parse.jl

@@ -364,3 +364,14 @@ end
         @test expr == Meta.parse(pf > pg ? "(x$(f)y)$(g)z" : "x$(f)(y$(g)z)")
     end
 end
+
+# issue 34498
+@testset "macro calls @foo{...}" begin
+    @test :(@foo{}) == :(@foo {})
+    @test :(@foo{bar}) == :(@foo {bar})
+    @test :(@foo{bar,baz}) == :(@foo {bar,baz})
+    @test :(@foo{bar}(baz)) == :((@foo{bar})(baz))
+    @test :(@foo{bar}{baz}) == :((@foo{bar}){baz})
+    @test :(@foo{bar}[baz]) == :((@foo{bar})[baz])
+    @test :(@foo{bar} + baz) == :((@foo{bar}) + baz)
+end