patch 8.2.0155: warnings from MinGW compiler; tests fail without +float

Problem:    Warnings from MinGW compiler. (John Marriott) Json test fails when
            building without +float feature.
Solution:   Init variables. Fix Json parsing. Skip a few tests that require
            the +float feature.

src/if_py_both.h

@@ -6357,8 +6357,8 @@ ConvertToPyObject(typval_T *tv)
 					    ? "" : (char *)tv->vval.v_string);
 	case VAR_NUMBER:
 	    return PyLong_FromLong((long) tv->vval.v_number);
-#ifdef FEAT_FLOAT
 	case VAR_FLOAT:
+#ifdef FEAT_FLOAT
 	    return PyFloat_FromDouble((double) tv->vval.v_float);
 #endif
 	case VAR_LIST:

src/json.c

@@ -761,9 +761,9 @@ json_decode_item(js_read_T *reader, typval_T *res, int options)
 		    break;
 
 		default:
-		    if (VIM_ISDIGIT(*p) || (*p == '-' && VIM_ISDIGIT(p[1])))
+		    if (VIM_ISDIGIT(*p) || (*p == '-'
+					&& (VIM_ISDIGIT(p[1]) || p[1] == NUL)))
 		    {
-#ifdef FEAT_FLOAT
 			char_u  *sp = p;
 
 			if (*sp == '-')
@@ -782,6 +782,7 @@ json_decode_item(js_read_T *reader, typval_T *res, int options)
 			    }
 			}
 			sp = skipdigits(sp);
+#ifdef FEAT_FLOAT
 			if (*sp == '.' || *sp == 'e' || *sp == 'E')
 			{
 			    if (cur_item == NULL)
@@ -889,7 +890,8 @@ json_decode_item(js_read_T *reader, typval_T *res, int options)
 		    }
 #endif
 		    // check for truncated name
-		    len = (int)(reader->js_end - (reader->js_buf + reader->js_used));
+		    len = (int)(reader->js_end
+					 - (reader->js_buf + reader->js_used));
 		    if (
 			    (len < 5 && STRNICMP((char *)p, "false", len) == 0)
 #ifdef FEAT_FLOAT

src/testdir/test_method.vim

@@ -1,5 +1,7 @@
 " Tests for ->method()
 
+source check.vim
+
 func Test_list_method()
   let l = [1, 2, 3]
   call assert_equal([1, 2, 3, 4], [1, 2, 3]->add(4))
@@ -118,6 +120,7 @@ func Test_method_funcref()
 endfunc
 
 func Test_method_float()
+  CheckFeature float
   eval 1.234->string()->assert_equal('1.234')
   eval -1.234->string()->assert_equal('-1.234')
 endfunc

src/version.c

@@ -742,6 +742,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    155,
 /**/
     154,
 /**/

src/vim9compile.c

@@ -1217,8 +1217,13 @@ parse_type(char_u **arg, garray_T *type_list)
 	case 'f':
 	    if (len == 5 && STRNCMP(*arg, "float", len) == 0)
 	    {
+#ifdef FEAT_FLOAT
 		*arg += len;
 		return &t_float;
+#else
+		emsg(_("E1055: This Vim is not compiled with float support"));
+		return &t_any;
+#endif
 	    }
 	    if (len == 4 && STRNCMP(*arg, "func", len) == 0)
 	    {

src/vim9execute.c

@@ -1095,6 +1095,7 @@ call_def_function(
 	    // Computation with two float arguments
 	    case ISN_OPFLOAT:
 	    case ISN_COMPAREFLOAT:
+#ifdef FEAT_FLOAT
 		{
 		    typval_T	*tv1 = STACK_TV_BOT(-2);
 		    typval_T	*tv2 = STACK_TV_BOT(-1);
@@ -1127,6 +1128,7 @@ call_def_function(
 		    else
 			tv1->vval.v_float = res;
 		}
+#endif
 		break;
 
 	    case ISN_COMPARELIST:
@@ -1618,7 +1620,9 @@ ex_disassemble(exarg_T *eap)
 				   get_var_special_name(iptr->isn_arg.number));
 		break;
 	    case ISN_PUSHF:
+#ifdef FEAT_FLOAT
 		smsg("%4d PUSHF %g", current, iptr->isn_arg.fnumber);
+#endif
 		break;
 	    case ISN_PUSHS:
 		smsg("%4d PUSHS \"%s\"", current, iptr->isn_arg.string);

src/vim9script.c

@@ -323,6 +323,7 @@ handle_import(char_u *arg_start, garray_T *gap, int import_sid)
 		    *arg = cc;
 		    return NULL;
 		}
+		ufunc = NULL;
 	    }
 	    else
 	    {
@@ -355,6 +356,7 @@ handle_import(char_u *arg_start, garray_T *gap, int import_sid)
 		    *arg = cc;
 		    return NULL;
 		}
+		sv = NULL;
 	    }
 
 	    imported = new_imported(gap != NULL ? gap