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891391a6e5
Usually, this occurs when preparing to input a method name
However, once an identifier is entered, it is not reasonable for the parsing result to change from `CallExpr(FieldExpr())` to `MethodCallExpr()`
Example
---
```rust
fn foo() {
x.
()
}
```
**Before this PR**:
```text
SOURCE_FILE
FN
FN_KW "fn"
WHITESPACE " "
NAME
IDENT "foo"
PARAM_LIST
L_PAREN "("
R_PAREN ")"
WHITESPACE " "
BLOCK_EXPR
STMT_LIST
L_CURLY "{"
WHITESPACE "\n "
CALL_EXPR
FIELD_EXPR
PATH_EXPR
PATH
PATH_SEGMENT
NAME_REF
IDENT "x"
DOT "."
WHITESPACE "\n "
ARG_LIST
L_PAREN "("
R_PAREN ")"
WHITESPACE "\n"
R_CURLY "}"
WHITESPACE "\n"
error 17: expected field name or number
```
**After this PR**:
```text
SOURCE_FILE
FN
FN_KW "fn"
WHITESPACE " "
NAME
IDENT "foo"
PARAM_LIST
L_PAREN "("
R_PAREN ")"
WHITESPACE " "
BLOCK_EXPR
STMT_LIST
L_CURLY "{"
WHITESPACE "\n "
METHOD_CALL_EXPR
PATH_EXPR
PATH
PATH_SEGMENT
NAME_REF
IDENT "x"
DOT "."
WHITESPACE "\n "
ARG_LIST
L_PAREN "("
R_PAREN ")"
WHITESPACE "\n"
R_CURLY "}"
WHITESPACE "\n"
error 17: expected method name, field name or number
```