Reject decimal points after hex float literals

JuliaSyntax/src/julia/tokenize.jl

@@ -1057,6 +1057,14 @@ function lex_digit(l::Lexer, kind)
                 if !accept_number(l, isdigit) || !had_digits
                     return emit(l, K"ErrorInvalidNumericConstant") # `0x1p` `0x.p0`
                 end
+                # Check for invalid trailing decimal point
+                # https://github.com/JuliaLang/julia/issues/60189
+                pc = peekchar(l)
+                if pc == '.'
+                    accept_batch(l, c->(c == '.' || isdigit(c)))
+                    # `0x1p3.` `0x1p3.2` `0x1.5p2.3`
+                    return emit(l, K"ErrorInvalidNumericConstant")
+                end
             elseif isfloat
                 return emit(l, K"ErrorHexFloatMustContainP") # `0x.` `0x1.0`
             end

JuliaSyntax/test/tokenize.jl

@@ -632,6 +632,10 @@ end
     @test onlytok("0x.p0") == K"ErrorInvalidNumericConstant"
     @test onlytok("0x.")   == K"ErrorHexFloatMustContainP"
     @test onlytok("0x1.0") == K"ErrorHexFloatMustContainP"
+    # https://github.com/JuliaLang/julia/issues/60189
+    @test onlytok("0x1p3.") == K"ErrorInvalidNumericConstant"
+    @test onlytok("0x1p3.2") == K"ErrorInvalidNumericConstant"
+    @test onlytok("0x1.5p2.3") == K"ErrorInvalidNumericConstant"
 end
 
 @testset "binary literals" begin

test/syntax.jl

@@ -1684,6 +1684,9 @@ end
 # #16356
 @test_parseerror "0xapi"
 
+# #60189
+@test_parseerror "0x1p3.2"
+
 # #22523 #22712
 @test_parseerror "a?b:c"
 @test_parseerror "a ?b:c"